On the way in this morning, I realised the lockring on the rear hub has come loose. Observing the sprocket merrily meandering from side to side, I realised the chainline would actually be improved if, when I tighten her up again, I pop some form of spacer spokes-side of the sprocket.

Anyone either a) able to suggest some economical products fitting this bill; or b) able to tell me what size the outer diameter of the splines is so I can see if I can fashion something suitable?

Ht2 bb spacers fit perfectly (but don’t use plastic ones).

interesting. cheers.

Use and old spacer from between sprokets on a cassette? The plastic bit, custom designed for it. LBS should have a few