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Prestolock Combination Padlock

Having read the FAQ's you are still unfulfilled and seek more enlightenment, so post your general questions here.

Moderators: zeke79, Squelchtone

Prestolock Combination Padlock

Postby stilte » Thu Sep 28, 2006 6:49 pm

I have managed to get my hands on a Prestolock 2620 and have been trying to manipulate it for hours.

I'm not too good with the sesamee decoder and my attempt gave false results. The look-between-dials method doesn't work as the axle is smooth throughout. I know the code, and tried feeling for a difference between the dials and numbers, but to no avail.

How is the code set? The combination at the time when the shackle is pushed in, is the combination that will be used to open it.

It looks like I'm the first person to post about this lock, it's not a very common brand, but I'm rather frustrated now and am hoping for some input.

Here's the lock:

http://www.cclsecurity.com/products/pre ... /2620.html
stilte
 
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Postby stilte » Thu Sep 28, 2006 7:15 pm

I think I better be clearer with the code changing instructions. You need to turn the shackle around, press it in first before changing the code.

In case someone was thinking of buying this lock for personal use, I would advise you not to. Security-wise, I believe that the metal can be cut through rather easily. It cannot be shimmed. On the right combination, I need to tug violently 2-3 times before the shackle moves, making my fingers sore after a few minutes. Of course, that would be a good protection against brute force attacks.

The lock has a decent and attractive finishing. Looks quite cute too. Hmm.
stilte
 
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Postby keysman » Fri Sep 29, 2006 7:29 pm

Are you talking about a 3 or four wheel combinaton lock? The kind commonly found on luggage?

Pull on the shackle and turn the wheels ....1 at a time .. you may have to find the wheel that works best .. any one of the wheels can be the 1st one to give up its #.. you will feel some 'give" on the shackle when the wheel is in the correct position.. repeat until the lock is open.

You may want to practice by only locking the lock with 2 of the wheels when you get the correct wheel in position you can feel the 'change".
Yes you can break them open very easily...
Everyone who eats potatoes eventually dies. Therefore potatoes are poisonous.
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Postby stilte » Fri Sep 29, 2006 8:30 pm

Take a look at the link, a photo of the lock can be found there.

This is a 4-wheel combination padlock, I could use it to lock my luggage, but it's a little too big and would probably cause some unwanted attention. People are more likely to use it to lock their bikes or lockers.

The problem with this lock is that it doesn't open easily even when the correct combination is set. I need to tug at the shackle a few times. Some times it still doesn't open, and I will need to hit it into the lock and pull it out quickly.

Could you clarify what you meant when you said to practise by locking the lock with only 2 wheels? Are you suggesting that I open it up?
stilte
 
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Postby keysman » Sat Sep 30, 2006 1:37 am

stilte wrote:Could you clarify what you meant when you said to practise by locking the lock with only 2 wheels? Are you suggesting that I open it up?


No don't open it up unless you want lots of little pieces that don' go back together well.
Set the correct combnation , then lock the lock and have 2 wheels "off" the correct combination as you hit the correct # you will feel a difference.
Everyone who eats potatoes eventually dies. Therefore potatoes are poisonous.
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Postby stilte » Sat Sep 30, 2006 2:09 pm

It's really cold today and I could barely write well, let alone pick my locks. I gave up 'feeling' the lock after 10 mins. I'll try it tomorrow, thanks!
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Postby stilte » Sun Oct 01, 2006 7:34 pm

After feeling it for an hour, I still couldn't tell the difference between a correct wheel from an incorrect one. So I dropped by a $2 shop and got a cheap combination luggage lock. The feel was much clearer and it was very easy to tell the difference.

I went back to the prestolock and my attempts were still futile. However, I have found that if the 3rd digit is correct, it doesn't matter what the 4th number is as long as it's higher than the correct one.

If the 4th digit is correct, then the 3rd digit can be +1 off the correct one. The 1st and 2nd dials are rather precise.

Other than this, the only thing else I carried away from this exercise are sore fingers and knuckles.
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Postby LockNewbie21 » Sun Oct 01, 2006 8:44 pm

Bro bro bro bro... Listen if its cold outside.. and this lock MUST! be opened.. try buyign one and practice..well.. inside.

I feel your cold pain though.. my DSL and Heat went out in my cardboard box the other night i was so cold i used to sports section to cover with :cry:

They look no more than a reg combo. Theres a flat section of each gate, your decoder is used to feel this, if you can't.. buy one go inside and keep trying.

next after all numbers are found, add three to each number.. theres your combo, 3 is usually the rule of thumb with them.

There not hard, andif you lock doesn;t function properly replace it. There just locks.
Image
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Postby stilte » Sun Oct 01, 2006 9:55 pm

I'm glad someone knows what I'm going through!

The prestolock is indeed inside my house, not outside. Here, I took a photo just for you. The prestolock is on the left, an ABUS is on the right. You will have to take my word that I did not put that thermometer/clock in the fridge or something similar. That really is the temperature inside my room, with the heater turned on, 1m away from the heater.

Believe me, I've tried the decoder/ flat surface thing. The axle is smooth, with random protrusions that don't mean anything. The 160/50 can be decoded by finding the flat surface, but not the presto. Spent an extra 2 hours moving the wheels around, but to no avail still. Grr... got to resist the temptation to get a drill...

It sure looks ordinary, doesn't it? But I it isn't! Now who would buy one to prove me wrong?

Image
stilte
 
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Postby LockNewbie21 » Sun Oct 01, 2006 11:22 pm

OOooo i thoguht you were outside lol my bad bro

Yea on each wheel there should be a flat area, some smaller than others, you use the tool to feel for that flat area.

No once you think you hav efound it turn the wheel up three numbers.

Though some trial and error and practice you should be able to get the combo.

The up three is usually the ammount, though i am not possitive but pretty sure.

P.s.. i lovvee saying i live in a cardboard box.. probobly will be one day haha
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Postby stilte » Mon Oct 02, 2006 3:32 pm

Well, I said the lock was mine, why should I buy a new one and not stand out in the cold? Give the cardbox hut a try in this weather, if you live, you'll have a great story to tell your grandchildren! :D

Now on the the good part... I decoded the little bugger! Thanks for insisting that this was only a regular lock, that made me go back again and again to try to decode it. Ah, after 5 days, I've finally got it.

No, this lock does NOT have a flat part on the axle (Unlike the 160/50).

No, you can NOT feel the gates with any tools (unlike the Targus Defcon).

Tolerances in this lock are quite low, and you can push the dials aside to get a clear view of the axle. I was wrong about the "random" protrusions. They aren't random at all. These little bumps are too small to feel properly with a tool, but that doesn't matter since you can see them.

There are a number of bumps on each axle, and once you find the pattern, you can see that the bumps define 2 possible numbers for each dial. So that reduces the possibilities down to 16, and all you need to do is try them all out. Statistically speaking, you'll probably find the correct combo without having to try all 16 possibilities.

Oh yeah, I drowned the locking mechanism in silicon lubricant, and it opens nicely now. I've noticed a trend. Why is it that I always seem to get "exotic" locks that nobody knows much about? Hmm...

I really like my Prestolock. Don't you think it looks cute? It gave me a harder time than the ABUS for half the price. The Targus was a joke too. Now off to something more relaxing... such as dinner. And champagne.
stilte
 
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Postby Schuyler » Tue Oct 03, 2006 1:58 am

mmmm.

They keep this lock on a chain that blocks the fire exit at my work. It was the first time I had seen it. Unfortunately it is owned by the building management and not our own management, otherwise I would get permission and try to defeat it.

Truth be told, having a chain across our fire exit is probably illegal anyhow, but who knows where the line is in those sorts of situations.
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Postby Raccoon » Tue Oct 03, 2006 3:20 am

The line is, it's ILLEGAL, and you can die because of it.

Cut the lock off, or call the fire chief.
You are in a maze of twisting little passages, all different.

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