I have just removed the camshaft spindles from a spare M20 crankcase and noticed that one of them has a thread in its inner end, i.e. opposite end to timing cover. Any ideas??? Regards to all and thanks for all the help and advice that comes from this forum. DAVE.

Any chance of a picture?...I've not seen anything like that in an M20/21, B31/33, Goldie in the last 50 years so I'm guessing this is something from a different model altogether...Prewar models aren't my forte, having owned few of them...Perhaps another forum member has come across this?...See my earlier post regarding variations more commonly found...Ian