Wow - yes, it really is a lot harder than I'd have expected for whats a pretty common and still widely used mower. Shame companies did stuff like that as really makes it tough on the end consumer. I'll grab the size of the drive pulley's when I have a chance - you're right being these are 20-30yrs old, they're ex-council mowers that then were used by a private owner for a bunch of yrs. - there's no knowing how much they've been chopped and changed - as I know the last owner bought up ALL of them he could and was using a bunch of them for parts to run the 2-3 operational ones.
Much thanks again.
