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Bump Proof, extremely pick/impression resistant lock!

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Farmerfreak

Active Member

Posts: 462

Joined: Tue Mar 02, 2010 1:00 am

Location: SLC, Utah

Post Fri Sep 03, 2010 1:31 am

Bump Proof, extremely pick/impression resistant lock!

To start of with, here is a link to this locks predecessor. http://www.lockpicking101.com/viewtopic.php?f=25&t=46768 Most of the info on how this newer lock works is covered in that thread.

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The wrong key.
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The wrong key only turns this far.
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The correct key will turn all the way.
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These side pins stick out of the master ring and lock it to the housing preventing it from turning.
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When the inner core is rotated 20ish degrees the side pins are allowed to drop in and allow the master ring to rotate.
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It isn't pretty, but here it is. It looked better before I realized I had to cut more out just to get the lock together...
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Here is a sample of how it is pinned up. The bottom pin followed by 2 master pins affects the bottom shear line. One of the three possible depths corresponds to the correct depth on the master ring. Remember that the master ring can't rotate until the inner core has rotated. I could have used more master pins for the bottom shear line, but I chose not to to lower the risk of the master pins rolling over sideways and jamming the lock.
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The only real issue with this lock is the way the master ring is locked to the housing. It's important to have it locked in place while setting the pins as it prevents you from getting any feedback on the correct shear line. But it causes some binding issues if you need to turn the key back the the neutral position without turning it all the way around. You can still turn it back, it just binds up more than I would like. If I were to have modded this out of a mortise cylinder, I could have used a better design for locking the master ring in place.
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KokomoLock

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Professor Emeritus Of Lockpickology and Smithery

Posts: 1107

Joined: Thu May 14, 2009 7:23 pm

Location: Indiana

Post Fri Sep 03, 2010 11:17 am

Re: Bump Proof, extremely pick/impression resistant lock!

Very wicked lock, has anyone at your shop picked it yet? I am still working on the mortise cylinder off and on with no luck so far!!!
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magician59

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Contributor
Contributor

Posts: 839

Joined: Fri Mar 13, 2009 10:38 pm

Location: Houston, Texas

Post Fri Sep 03, 2010 2:03 pm

Re: Bump Proof, extremely pick/impression resistant lock!

Corbin/Russwin master ring cylinder. Shame someone chewed up the plug like that. It probably wasn't pinned correctly from the beginning.
Nemo Malus Felix
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mbpick34

User avatar

Familiar Face

Posts: 146

Joined: Sun Jun 13, 2010 12:55 pm

Location: Norway

Post Fri Sep 03, 2010 7:31 pm

Re: Bump Proof, extremely pick/impression resistant lock!

very nice lock must be a bastard to pick it
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Farmerfreak

Active Member

Posts: 462

Joined: Tue Mar 02, 2010 1:00 am

Location: SLC, Utah

Post Sun Sep 05, 2010 12:04 am

Re: Bump Proof, extremely pick/impression resistant lock!

KokomoLock wrote:Very wicked lock, has anyone at your shop picked it yet? I am still working on the mortise cylinder off and on with no luck so far!!!
Nobodies really spent any time trying to pick it. I guess that means the answer is no, nobodies picked it. Everybody here has seen the key which would take the guess work out of it and make it much more plausible to pick. Not easy, just plausible.

magician59 wrote:Corbin/Russwin master ring cylinder. Shame someone chewed up the plug like that. It probably wasn't pinned correctly from the beginning.
Hey,...It's fun to chew up cylinders. :twisted:

I did find a potential exploit when I was keying it up though. It allows you to be able to decode if the top shear line is keyed to a number 1 depth (Corbin system 70, uses depths 1-6, 6 is the deepest). Here is what you need to know. The stack height for a 6 on the bottom shear line is the same stack height for a 1 depth on the top shear line. So if you can turn the cylinder to the false set in one chamber at either a 1 or a 6 depth, it'll be a number 1 depth. All this really means is that when I key it up I shouldn't use any 1 depths in the lock, but as is it could allow you to decode at least one of the cuts in the lock. :wink:

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