Thank you for your comment on this one.
I know my lathe well and can make the spindle diam 0.01mm smaller than the inside bearing ring diameter. I assume that wouldn't cause any significant wobble with the relatively low rpm?
Maybe I'm just the one to try this out and take weekly notices of the bearing blocks condition. Then we could all gain a learning experience and get the issue settled. As I hope, it could be a relatively cheap way for people to make their own blocks, if they would bother to invest the time in the manual work. Me, I have great pleassure every time I get nearby a lathe or mill