MasterLock Fusion U-Lock

[Wolf2486]

I know I saw a post on this before but I cannot seem to find it. I've acquired a Master Lock U-Lock Fusion. It works off discs, much like an abloy (I assume not as secure?). Anyway, it was only $17, so I bought it just to practice on ( I don't own a bike). So does anyone have any suggestions on how to pick this thing?

Thanks.

[Wolf2486]

Here's a pic of the lock if that helps

http://www.masterlockbike.com/product-d ... &pid=27313

[tacedeous]

a pic of the keyway would help... when the say disk, i wounder if they really mean tubular... anywho put a pic of the keyway up..

[Wolf2486]

Couldn't really find a pic of the keyway on the net and I don't have a camera with me at this time (I might try to borrow a friend's later), but here are two youtube videos that are reviewing similar locks that use the same kind of key.

http://www.youtube.com/watch?v=vQpdy6Fhelc

http://www.youtube.com/watch?v=PX_Pc77qzAc

It is not a tubular lock, it has discs that are notched and all like up to a sidebar, the sidebar falls in and the cylinder can turn to release the bolt. As I said before, it is very similar to an Abloy lock.

My question is whether or not there is any security flaw that will allow for this lock to be picked far easier than an abloy (i.e. an easy way to put tension on the sidebar).

[Olson Burry]

I posted something a while ago asking a similar question, it was a bike lock but not a U or "D" lock. It was however a Disk detainer mechanism as i think you are describing.

My post is here where I took it apart towards the end.

To pick it you'd need something like this.

I have my own thoughts and plan to practice making some manual tools however I need a new lock to practice on now.

You are right, the disks need to be rotated to allow the side bar in and then you can turn. One or more of the disks in there will be specifically for rotating the mechanism. I think abloy may use the furthest disk which is why i dont think the ICL disk detainer pick will work but less secure ones may well use the first.

There are some youtube vids on use of the ICL detainer pick.

I was told however that picking these is considered advanced material so i may have already said too much here even if I'm wrong so...

[raimundo]

Do you have a copy of the lock and key? if so, how much resistance do you get to turning the key. Some of these disc locks are very low tension pieces, If you can turn it and unlock it with no friction against you,

Next, try this, find a piece of round plastic tube, probably the size of one of the parts of a pen that are inserted into the pen tube. look for that kind of plastic that is a bit flexible, and not prone to fracturing, (bic biro) cut one end of the plastic tube so that it has two fingers sticking out, opposite on the end that fits into the keyway area of the lock, this will be a plastic tensor, you can work a T pick right through it, This kind of tensor will tension only the first disc, if made right. and it will work on the type of locks that are first disc tensioning.

A T pick can be made from a 16 penny nail, by filing down the shaft just behind the nail head while the nail is turning in a drill chuck. this leaves a round shaft.

Nail head should be shaped before the shaft gets too thin.

You put this nail through the pen part and you have the most basic pieces to open the front disc tensioning abloy knockoffs, fancier picks have the shaft calibrated, but you can actually open these locks with just that little bit of tension and some exploratory back and forth in each disc space.

be sure to polish the pick tip and shaft so that it does not friction and move the discs when you don't want it to.

Handles can be added to the two simple pieces mentioned above, but the handles will reduce the feel as they add leverage.

[Wolf2486]

thanks for the info guys!

Do you have a copy of the lock and key? if so, how much resistance do you get to turning the key. Some of these disc locks are very low tension pieces, If you can turn it and unlock it with no friction against you,

I don't get very much resistance at all. It turns smoothly for a little bit, has a tad a catch before the locking bolts rotate out of place allowing for the release of the shackle. I just assumed that the catch is just the cylinder grabbing the shackle.

I will definitely to try and make that pen/nail pick, thanks raimundo.

I was wondering, since there is some space between the lock and where the U bold part inserts, would I be able to put tension on the disks by putting a small piece of metal into the hole and pushing on the part that locks the U bolt in?

[Wolf2486]

it will work on the type of locks that are first disc tensioning.

When you say "first disk" are you referring to the faceplate that moves with the key or the first disk behind the faceplate?

[raimundo]

I don't know this particular master lock, but if it has a faceplate, that would be free rotating, while a first disc can pickup, will turn about a quarter of a turn then stop if it does not pickup the can and carry it around. (can = plug, i guess)

[Wolf2486]

I don't know this particular master lock, but if it has a faceplate, that would be free rotating, while a first disc can pickup, will turn about a quarter of a turn then stop if it does not pickup the can and carry it around. (can = plug, i guess)

Not 100% sure what you're saying, but all of the disks (including the first disk and the faceplate) can turn a quarter turn (90 degrees) before stopping. None of the disks (faceplate included) can rotate freely 360 degrees.

[raimundo]

Then its probably a fair bet that you have a knock off that is first disc tensioning.

You can cut the tensioner with a razor from a bic biro (plastic that will not readily fracture) from the small part that holds the refillto the pen barrel at the writing end, the part that is tapered on one end and pushed into the pen barrel. Then end that is not tapered is the part that fits into the keyholle at both ends when cut to fit. do not make these tips reach too deep, or they will affect the second disc.
A good pick can be filed from a nail, but a flat steel T pick might work if you can design it so the pick shaft goes through the center of the tensioner.
I don't have your lock here, but likely without dirt inside, there is no resistance to tension and so tension can be very light.