Dave,
My brother has a motoplat ignition fitted which touch wood has never let him down. He has a brass ring shrunk onto it for added weight.
I will need to sort something out for my greeves so will do the same or try a PVL system. Have looked at the Rex Gaunt website before and he is not the cheapest!!
Got my PVL B40 ignition off Alan Whitton and never had a problem. Who does them for Villiers ??
Steve.