obvservation is that > striking the hammer hard, re-sets the string level, could it be that the > hard striking cuts the hammers in relation to the unlevelled strings > and not level the string. > > Barrie, I don't know, perhaps both occur. Since mere rubbing and lifting resets string level, wouldn't fast test blows esp. with big heavy hammers? If both happen, is this inferior to levelling strings alone? Where strings need leveling, string marks are typically unequal already. Only filing and leveling would be a complete fix, however matching is better than not matching so there will be some improvement -Mike
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