by chriswingate » 21 Mar 2011 21:10
Master locks, as easy as they generally are, can sometimes be tricky. Not that they are great locks, but the tolerances are so loose, and there is so much slop or turning in the plug while it is locked, make for it to be difficult sometimes to set pins or feel what is going on inside the lock. It's all practice, like Gapper said, put it down and take a break from it occasionally.
As far as what Gapper said about the tension wrench slipping and getting caught under a ward, you can always try switching to top of the key way tension. It can help by having the rotation of the plug being more centered, if there is a lot of wiggling in the plug to begin with. Give it a shot, see what you think, if you don't have a tension wrench with a small tip, you may need to trim one of your current tension wrenches, so it fits in the top of the key way, and doesn't slip and fall out easily.
Hope some of this helps a bit.