If your studs are the same as the TR4 and are peened on the back side, I'm not sure a machine shop will do anything different than what I did myself. I ground off the peened material so the stud could simply be unscrewed and a new one screwed back in. I of coarse did not peen the back side of the new stud, only used lock tite and have not had any issue. I did this 5 years ago and check the stud every spring to make sure it is still holding well.