retrofitting

g'day everybody, BIG EDIT: here is a step-by-step (ish) account of how I changed out the Wilferite Mk.II Just-a-nut for the old-school brass JAN Mk.I on my Thumb 4BO. There's a problem common to many owners of Warwick basses, in that the Wilferite Mk.II Just-a-nut can easily break if you...