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[James Dally]

I installed new butts and hammers on a Kroehler upright.  I have checked
the brass rail and the brass butts where the screw goes in.  This is the
type where the screw goes through the rail and then the brass butt receives
the threaded screw.  The butts have been replaced where hammers have
loosened but the problem continues.  When it seems I have solved the
problem, another hammer loosens.  As near as I can tell the rail is not
cracked.  If anyone has had experience with this problem I will certainly
appreciate advice.  Jim Dally