I have a large early nut but I have never gotten around to using it.
The large nut used on the early M20s should go right through the star damper just as it does on the bakerlite and metal knobs, then there is a tagged washer and spring inside that, also smaller than the hole in the star.
I do have a reduced length centre nut but I haven't worked out if someone had cut a standard one down or if it has another use?
Hi rob
In the shop today - I see the back of the nut is a fraction away from the star washer so I guess all is ok - I had thought it would bind
Will send you a photo as I can’t post
Thanks for your photos
Br
Job