Britbike forum Forums Thread Like Summary - Final Drive Cover Plate

Why the casting nub? This one has wear on the high side.

They put the 'nub' on the plate to get some bunch of idiots in the next century
to spend inordinate lengths of time discussing it and the whys and wherefores
of it's totally useless purpose.

I've heard it said that the nub is clocked to the rear and used to assist prying the cover off. Prybar between the sprocket and nub?

Well yes, always. When I disassembled the engine there was no felt washer. Same with the other '65 engine here.

Maybe we should try to collectively think about who might actually KNOW what it was for.... 60s BSA worker, repro parts designer, etc rather than just us guessing whether it might be a perch for a very small oily canary or some sort of biker sex toy.....?

I don't have any ideas, though...

Lannis

The nub being there as an aid to prying the cover loose seems to be the most logical explanation.