Tue Nov 05, 2013 3:24 pm by rai
What femurat said, the key as best I can see it has about 3 different cuts in the bitting, all very close together,
pick this lock and while the plug is turned, take a diamond pick and ride it up and down over the pins, watch the shaft of the diamond pick and see if the bumping along the pins corresponds to what you see on the broken key, and deep or high pins will be easy to learn the positions of.
if the bumping diamond pick riding along the pins that are stopped by the cylinder wall, corresponds to the broken key, it may be that the broken key is a bad copy that is near the true bitting but just does not fit.
if you are familiar with impressioning, you know how you have a key that is not turning until you finally get it right and suddenly it turns, often turns hard because its too tight and this will leave heavy marks on the key blade so even after getting it to turn, you still have to file it a bit more,
a bad fitting key that works this way is cut too high, a key that is cut just a bit low, will not open the lock until you lift the key in the keyway or withdraw it until the pins climb a bit on the peaks and the key sort of picks it open.