I have an el-cheapo air hammer that the adjustment knob bolt broke off of. wouldnt be an issue except the it needs to be adjusted.
the bolt was and allen head type, and was countersunk, the botl shaft is about 3/8 in a 1/2 hole. impossible to get a vice grips or likewise in there to get it out. same with trying to dremel a slot in it to turn it with a screwdriver.
I thgouth about trying to weld a 1/4 bolt to it. I should have barely enough room to get the 1/4 in, and a small arc weld rod. just want ti stuck enough to get the bolt out to replace it.
anyone have a better suggestion? I am all ears