Clutch juddering - 1st gear only.

If memory serves, it's an M8 bolt - is that correct?

 

Possibly
I can’t remember off the top of my head

 

Yes I think its M8.

I think when my gearbox came back from Bears that thread felt better than when it went..

It's almost a job for a short M8 stud wound into a cleaned hole with JB Weld.

 

That would be a good solution, can't see a downside.

 

Any particular flavour of JB Weld (there seems to be quite a few to choose from).

 

The basic slow setting plastic metal epoxy original, as sold to farmers. (takes about 6 hours to set / 1 day to go full strength). Gearboxes get quite warm, but even the basic JB Weld can go to about 250C AFAIR.

The faster setting an epoxy glue is , the less strength it seems to have.