It appears that all the adaptors available from EV conversion companies are made in the US and all have UNF threads.. The WORLD is METRIC.. I wonder why they are taking so long to catch on!
Grrr..Out again, can't make it fit! My supplier hadn't told me that I had to drill out the end of the motor shaft to allow the gearbox input shaft to fit inside it... He'd sent me a very out of date set of instructions... Drilled and fitted now.