Hi All,   I recently bought a second hand relic Limelight Jazz - absolutely love it.    However where the bridge has been reliced and rusted, the grub screws have seized slightly in the saddles, and about half of the slotted heads have now broken during adjustment as they need a fair amount of force to turn, and so need replacement.  They are about 12mm long but no idea whether the are metric or imperial, and don't have suitable calipers to measure diameter.   Does