Hey guys... Does anyone know the mounting bolt size on the Simplex retro friction shift levers with the simple curved/cutout levers? I tried to thread them onto my older Simplex shifter clamp and it is a no go. They appear to be the same diameter but a different pitch...or...??? Tapping the clamp (or another clamp) is no problem but I can't measure the threading. How is the mount bolt removed from the housing...???

TIA
-Mark in St. Louis