Hi Mark, sorry took so long, in bed crook fri & sat. Got up early this morning, done as you suggested as well as followed instructions you submitted for me and hey presto, working like a new one. Both plates were rusted in one position, but after a light rub, a little tap with rubber hammer and a bit of rust removing spray, which was cleaned up so as not to cause slippage on drive cone, was able to adjust drive plates to suggested gap using my feeler gauges . Thanks for the help and information Mark, much appreciated, Paul.