Merv
I had a fiddle with them the other day. The 2 rear ones only need a bit ground off the back to get the fit pretty right. The front ones have got me scratching my head though. It's wet here again today so I'll put grass cutting on hold and head to the playroom to see if I can sort them out.
I'm frustrated atm waiting for a new dizzy and coil from Summit as the beast won't start and it's ready to engineer.........learn't my lesson, don't buy stuff from that well known peddler of cheap engine parts on ebay

This time I think it's the PIP sender in the distributor, having already replaced the dodgy TFI module.
Greg