4-digit master lock help

[kg1188]

i have a 4-digit master lock #643D and it has been impossible for me to find a method to pick it, or even to find its combo. does anyone have any proven methods for opening a master 4 wheel combo lock?

[lunchb0x]

they have been covered here before, I think they are under sesame decoders so you should be able to find your answer by searching around.

[cppdungeon]

Weak! These are actually REALLY fun. Using the following method you dont need any tools or anything so its super hackarific and cool. I will post a guide here later, with some nice pics, but basically all you have to do is pull on the shackle and feel the wheels a bit. its a lot like picking, but with your fingers. try it out a bit, and you should get the hang of it. Be warned: the lock you posted might have false gates.

[raimundo]

While pulling a bit on the shackle, which you can do by putting a loop of cord through the shackle and using your foot to pull on it, put your thumb and forfinger at the place where the lock body is raised a bit and one leg of the shackle enters the lock. this is the place where you will feel the tiny kick when a wheel sets. This particular feedback is the only real postive feedback you will get.
while pulling on the shackle, stroke a finger or thumb over the wheels, so that you are pushing them to one side of the slot, opposite the pull on the shackle. then watch closely as you release the pull on the shackle, look for one of the wheels to move a bit as it is released released from the shackle pressure. This would be the wheel to start with, turn it while feeling the shackle/lockbody interface for the tiny kick of the gate setting.

if you just lightly pull the shackle while brushing the wheels in the opposite direction of that pull and do this repeatedly to see which wheels are moving when the pull is put on the shackle, you can tell that that is a binding wheel, any wheel that is not affected, is possibly at the gate and should not be moved, or it could be that another wheel is taking all the pressure and relieving it.

You may be able to just feel how resistant to rolling over a wheel is and that would also indicate its touching the fence, until is goes loose, but this is not a method that gets good feedback on all locks. the shackle/lockbody interface is better.