Just thinkin about wooden knobs on a bass.. just a few questions.. Do the one purchased online fit normal sinpdal size on the pots. hard they fixed with a pilot screw to hold them in place or a push pull?.. The metal spindals on bass pots ...do they wear the inside of the wood...the ones Ive seen them on tend to have plastic spindals?... Also do u know anywhere u can get them in the UK?... Sorry for a buggy question..!!