I think I've decided they originally (mine at least) are Cycle thread (BSC), 1/4" for knee pads, and 5/32" for the badges. 5/32 BSC is same pitch as WW (32 TPI), but thread form is 55˚(BSW) instead of 60˚(BSC). Bought some SS ones at the boat shop but haven't yet used 'em.