With all the talk about cracking MasterLock combinations, and how to open a masterlock in 50 guesses etc, it got us thinking.... There has to be a better way. Surbo did some checking and apprently there is a shim type device you can buy for $20 that will open a MasterLock instantly, but who wants to pay for it? Surbo shows us how we can make this shim for under $1.
This article is slightly outdated, please read "Beer Can Padlock Shim"
Materials Needed:
- Source of thin metal. We will be using your standard Yellow Buss Fuse container. We also fooled around with Altoids tins and beer caps, but found the metal to be a little thick, which would still work, but you would probably need to sand it down or something. Another possible source would be a beer/soda can.
- Tin snips, or some other way to cut the metal
- Pliars to help shape the metal
- A Victim Masterlock to practice on.
1) Get a box of fuses
2) Using your tin snips (or other cutting device) cut the metal cover up into strips
3) I used the edge that said USA
4) Cut the edges off so the metal is flat
5) Put the corner of metal into the lock and rotate it around to give
it the shape of the lock.
6) The metal should look like so. 
7) Insert the the metal at the base of the lock and it should pop out like
so. You have to have some strength to push the metal down. (DON'T CUT YOUR SELF)
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Press play below to watch a demo video video