The best test is to throw the hammer down as fast as you can to see if it will hit the screw. Peeling is not uncommon but you only need a little clearance for proper function. Peeling could cause the shank to hit the screw because the hammer could come off the string at near one hundred miles an hour. Most likely about 50 mph but give yourself a little safety margin there. If one screw is a problem try screwing it deeper into the button or you can nip off the top a bit or saw off some at the other end. When they get it wrong we have to make it so. Newton
This PTG archive page provided courtesy of Moy Piano Service, LLC