Its a perfect job for the surface grinder if you have one or know someone with one.
I'm sure if I tried making one like that it would come out like a cone washer!
To be fair to (myself) the bike, I would have gone through all this regardless. I’ve been bitten before believing someone’s abilities/statements, so would rather check it for myself, then if it goes wrong, its my fault.
Your worm is a lot better than mine was, which was nearly knife edged, it never made a sound ASAIC.
Someone must love me today... She’s called Lisa at the local Bearing suppies.
I need 3 bearings 2 Hoffmann deep ball thrust, and a parallel sliding roller. Total cost around 375quid.
Lisa just rang me, in stock tomorrow. 120+vat
Result ! Probably old stock and being Imperial, they want rid.