Excellent explanations, but one thing more. Be certain that the resulting hole in the hammer is smaller than the square on the tumbler shaft. Reason is that you do not want the screw, when tightened, to draw the outer face of the hammer all the way down to the end of the tumbler shaft. In order for the screw to be able to keep the hammer tight on the taper, there must remain a slight space between the back of the screw head and the end of the tumbler shaft. If it ever reaches the point of being flush, the hammer will loosen with use because the screw no longer has "purchase".
SRH
Last edited by Stan; 05/04/15 06:28 AM.
