Hello Keith, Clark and List Keith said: "I haven't seen one thing mentioned that will definitely cause hammers to bobble." My tuppence-worth here relates to the one thing I know which will cause an upright hammer to "bobble" - a broken Butt Spring. Nothing then will cause the hammer to "get back past the point of no return" if that spring is bust and the piano keys merely "caressed". If you couple that scenario with a Jack Button set to non-setoff (by bending up the set-off rail supports) you have a true disaster on your hands. And I don't have that much-bespoken-of "flame suit" do you get them at Woolworths? Regards from clear-blue-skied Sunny Sussex (at the moment) Michael G (UK)
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