Bob O'Ling Hammerz

[stanwood]

I don't believe I've heard key dip mentioned in any of these conversations.
My first reaction to bobbling hammers is insufficient dip.  For a player
mechanism, the dip would be a function of how far up the player pushes on
the back of the key. First I would look for lost motion between the back of
the key and whatever pushes up on it from the player mechanism.   If there
were no lost motion then I would ask the manufacturer how much stroke the
mechanism makes and if there is any adjustment of this.  If not then I would
surmise that the only way to prevent bobbling is to settle for a higher
hammer line.

David C. Stanwood