Gonzales
Locksmith Service

GONZALES LOCKSMITH SERVICE, Santa Fe, New Mexico, USA
505-920-5004     *     info@gonzaleslock.com
BUMP-KEYS : Bump keys do work on a variety of PIN-TUMBLER locks exploiting a
inherent weakness in the design. The standard pin tumbler design has served us very
well for over a hundred years. Simple to manufacture and work with. Just like
"skeleton-keys" were a threat to old-fashioned bit-key locks, bump keys are a threat to
many standard pin tumbler locks.

I usually add my own version of pick and bump resistance when I re-key locks on my
service calls. It doesn't cost extra and I usually don't even mention it. I have been doing
this even before the bumping thing became widely known, I simply wanted to give them
more pick-resistance to add value to the service. I can't even pick them myself  in a
reasonable amount of time by ANY methods. I usually end up drilling them if I have to go
back because of lost keys.

Master Lock Company has developed what they call "Bump-Stop" technology and it is
effective against bumping and the
locks are reasonably priced. The version with the
combination lock is a great hedge against locking yourself out, something I need.
However,
Bump-Stop isn't very effective against traditional lock picking. I still think it's great
that a manufacturer did something to improve their product, though.
Bump-Stop is an
option now  and is supposed to be standard on most
Master and American padlocks sold
through locksmiths. It's also available on many types of replacement cylinders for door
hardware. Available in many popular keyways.

Standard cylinders can be made bump resistant, but they are still standard cylinders with
the same standard keys everybody already has.

Beyond that are products like MEDECO AND ABLOY.  I don't see any way for bump keys to
defeat Medeco's sidebar and key-bumping simply does not apply to Abloy locks.

More information about lock and key-bumping can be found on the
DOWNGRADE page.
BUMP-KEYS
Counter
Master Lock deadbolts with Bump-Stop
technology. The one on the bottom is operated by
either key or by dialing-in a combination. Both of
them feature "Night-Watch" which, when set from
inside, blocks all outside access form key or
combination.
CAN'T BUMP THIS!
This padlock has the original Ace II cylinder most commonly
associated with vending machines and burglar alarms. Also
very common on bicycle locks. The original Kryptonite used the
Ace II cylinder for many years. When they got assimilated by
Imgersoll-Rand, production got shipped off to China and a
cheap knock-off cylinder was then used. It backfired, someone
figured out how to open them with a pen and it was all over the
net. Master Lock sold many locks from the same factory
including a padlock aimed at contractors. Kryptonite now uses a
rotating-disc cylinder similar to Abloy. A company called
On-Guard Lock formed to take the place of Kryptonite as King of
the bike locks. They are available at finer bike shops.

The original Ace II is very difficult to pick unless you practice.
Similar cylinders are usually not too difficult with practice.
Check out my BLOG!