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
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