Somehow I've managed to lose my collar. I can't work out how as I put everything together in tubs etc. as I disassembled to get the gearbox out, but somehow I managed it.
So as I'm in Singapore my simplest option is to get one made up, shipping a tiny bit over makes no sense!
Can anyone give me the correct dimensions, the BSA number is 66-4169, I can the sketch the part and get it turned up locally, with a bit of leg work.