On this very nice Yamaha CFIII-S, a few initial adjustments needed doing so that the pianist could play it for a while. A day’s service is to come later.
Meanwhile, one bass hammer (the B) is catching on its neighbour (the C):
But, as the hammers are not to be re-faced until the service, the solution to this wee problem must leave the B striking the strings exactly in the same place (otherwise, the hammer will try to ‘dance’ back into its old position, making a poor tone and weakening the centre pin).
My solution: move the C hammer’s resting position to the right, then travel it to the left – and a correct strike. (NB This is only acceptable as a temporary solution, as the C hammer now has a curved blow trajectory, which will ultimately affect its ability to produce a clean sound)
Thus, the B now has a clear blow (and everything sounds as before):