[SEL] Adjusting Rosebery 3C bearings?

[Glen Harris]

I'm posting this on behalf of my father, who has a Buzacott/Rosebery with a 
nasty knock in the main bearings - they're rather worn and he can wobble the 
crankshaft by hand. The instruction manual mentions adjusting the bearings, 
but with no details on how to go about it. The parts list shows the 4C and 6C 
have a two part bearing which would be adjustable, but not the 2C or 3C. Is 
this fixable in a garage workshop, or is it beyond his means?

On a related note, is there a service manual for these engines?

Thanks, glen.