Master Lock's BumpStop

[stran9er]

It says that it makes locks 4 times harder to bump. Is it true?

[mh]

It says that it makes locks 4 times harder to bump. Is it true?

Well, if you don't use a hook to feel inside the lock, you don't know which out of the 4 pins in the back is the one which can't be affected by a "normal" bump key, so you need 4 differently cut "special" bump keys.
Or actually 2 on average.

Cheers,
mh

[Beyond]

Cut all down to 9's with the last depth being a 1. We had a display at our shop and then I just cut a similar key, bumped it on my 3rd try. Because of the nature of the "anti-Bump" pin, it can't be any more than a 1 cut. Anymore and you wouldn't be able to push it past the shear line. Cut the others as you would a bump key and the last one a 1. You'll bump the rest and that 1 cut will manually push the pin past the shear line.

[stran9er]

So that one pin is really close to the shear and is easier to pick, right?

[Beyond]

Theoretically, I guess so. I didn't try to pick it. I saw the "Anti-Bump" tag on it and instantly knew what I wanted to do to open it. Picking Masterlock's are elementary at best, I wanted to see if I could bump something that proclaimed it was "Anti-Bump".

Masterlock's website shows you a virtual cutaway of the lock that you can look at to get a better understanding of what I'm talking about. I know they sent the shop I work at 2 demos with 2 different keys. Both keys had a 1 as the last cut. I assume any size could work but 1 seems to be the most logical and, from what I have seen, the most widely used.

http://www.bumpstopsecurity.com/ml-bump ... tech.shtml

[Beyond]

Sorry to double post but think about the design. I mean, you don't want contact between the key pin and the anti-bump pin. Theoretically you would want the most space between the two to prevent any sort of bumping to occur.

Logically that's a 1 cut, typically the most shallow of any cuts to a key. I mean, I can understand a 2 or 3, but I can't foresee why they wouldn't just keep it at a 1 to have the most distance between the pins as possible.

It also explains why they only have 1 "anti-bump" pin. You can't have more than 1 or you're making it too uniform and easy to pick, especially if someone knows the design process and implementation behind it.

Does anyone else's shop have one or has anyone played around with them?

[stran9er]

Oh really? I thought MasterLocks would be the harder locks to pick.

So the oversized tumbler stays in one place... If you were to turn the lock upside down would the pin fall on the shear line?

I'm trying to say, if you turn the lock upside down would you need to do anything with that pin? Does it make the lock more or less effiecent against picks?

[Beyond]

So the oversized tumbler stays in one place... If you were to turn the lock upside down would the pin fall on the shear line?

That's a great thought, and one I can't address. The ones I messed with were mounted into pieces of wood for display purposes.

I'm trying to say, if you turn the lock upside down would you need to do anything with that pin? Does it make the lock more or less effiecent against picks?

I really have no idea how it acts against picking.

Another thought I just had, if they placed the anti-bump pin in between the first and last pins, you wouldn't be able to use my method because the pins beyond the anti-bump pin wouldn't get the true effect of a bump key.

Wonder why they didn't just do that on all of them. Their website shows both methods.

[WOT]

What's 4 times more difficult?

If you bump 1,000 times, it yields 75% less success?

[Beyond]

What's 4 times more difficult?

If you bump 1,000 times, it yields 75% less success?

The exact question one of the guys at work had.

[LeeNo]

4 times more bump resistant means it takes 4 bumps to open instead of just 1.

[Beyond]

4 times more bump resistant means it takes 4 bumps to open instead of just 1.

With what as the control? A normal bump key? My modified bump key? It's an open ending statement lacking merit or proof.

[mh]

I still find my explanaton for the number "4" quite convincing. There's no need to put the modified pin in the last position only.

[raimundo]

there you go again beyond? Is every conversation an arguement?

[Beyond]

there you go again beyond? Is every conversation an arguement?

Since when can you sense tone?

Just imagine me asking that with a hurried question kind of tone. It's not an argument, I just don't understand their claim. I can bump them with much more proficiency than 1 out of 4. I'm genuinely curious as to what they're basing their number off of.