Bit more progress tonight......going to repair the broken stud....found a long 6mm nut at thd bottom of my tool box, bored out to 7mm and ran a 8mm tap through, then wound it onto a 8mm stud and locked it with another nut.ground it round to 9mm od on the bench grinder.this fits on whats left of the stud.so I now have a female thread ready to accept the new stud.wii have to open up the clamp hole by 1mm to take the new fitting, also made a spacer which fits over the fitting between the clamp and nut, this will give me extra thread that I need as the old stud is not threaded all the way down....I will trim this spacer down at final fitting for neatness.......hope the pictures explain the repair better than the text :rolle
One, is never going to be enough.....