Of course center the hammer where it need to be and drill the hole for the hammer mounting screw. Of course you have not filed the square yet. Heat and place a nice coat of solder on the back side of the hammer where the sqaure will mate. Place the hammer on the square (tumbler) and carefully snug down the screw exactly where you want the hammer to be. Then lightly strike the hammer with small hammer on a socket wrench that fits over the head of the screw. We don't want to injure those threads on the screw and tumbler. The solder on the back side of the hammer should show a perfect fit of the tumbler. Since you have already drilled the hole near to the tumbler size, you may want to fill it all with solder and drill that small hole first, then do what I suggested. Carefully file the hammer to the correct fit and don't forget to give the sqaure hole a taper, so it tightens as it is placed on the tumbler. Of course when finished, heat it all and clean off the solder. Yes, I would anneal the hammers and caseharden them after I am content with my fit. I hope, I didn't confuse you....
Last edited by Dave Katt; 11/08/06 12:03 AM.