While the collar on the arbor does control end shake, it's tiny and easily lost. So I took it off for a more robust endshake spacer that won't get lost and is easily replaced if it ever wears out.
Scrap steel shaped and drilled and countersunk to fit on barrel, between arbor hole and the heal pins.
Here shown rough shaped, yet to be straightened, thinned and polished.
Scrap steel shaped and drilled and countersunk to fit on barrel, between arbor hole and the heal pins.
Here shown rough shaped, yet to be straightened, thinned and polished.

