I invested in a set of Halford Proffesional Stud removers, four in the set 6, 8 , 10 , 12 , got them on offer at about £30. Absolute Godsend!
JB Weld , do you mean the paste? I use plasteel, it was the only stuff I found would repair a one inch square hole in the sump of a Disiel engine. But it can be cheap enough to get replacment second hand in good condition.