knuckles

[David Graham]

I have successfully "voiced" this problem out by inserting a voicing tool
from the side of the knuckle.  Be careful not to push on the knuckle
without supporting it from the other side or the teflon click will be worse
than any noise the knuckle might make.  I would not drill it out, I think what
would happen is that the knuckle would deform with play.