Thanks for the input. I guess I was right but it seems a bit bizarre to say the least. I'll give it a go. Apparently it has been like that for 45 years so it must work. It is an odd or clever design. I like the belt and suspenders approach with the lock nut but I guess I have no choice.

Mark

Mark
1970 4/4 Morgan
Two '53 MG TD's
1949 MG TC
1988 Porsche Boxster