Thanks for the Fowler link Max. How do you know the woodruff key is the same size? I've ordered one anyway and hopefully that will sort the problem.

On the coils, even if they are working (hopefully!), they do look like original equipment. Can I replace with a new 12v coil off another bike model? Is there a well used replacement or upgrade?

Anyway, front brake refurb kit came and I've changed the pistons and seals a given 'em a good clean. All bled up, new pads and they lookin good. Although I'm going nowhere at the mo, I'm ready to go somewhere! Ha! Stropping is not a problem. going is! 😁

Thanks again for your help mate.