what do you mean by center punch stud on the side. i think i will go the epoxy route though.Just push the driver back on, and center punch the stud on the sides in a couple places.
Or buy the wonderful gray concrete metal epoxy available at home depot.
Put the handle back on, and use a center punch on the end on the screw stud to deform the screw stud steel end out so it locks the handle on.what do you mean by center punch stud on the side. i think i will go the epoxy route though.
I have a shelf support shaft on a wire rack shelving that had the threaded insert loosen, the one that has a female threaded hole to accept the male threaded caster stud. I fixed it by what you suggested, drilling/tapping the shelf support shaft for a 1/4" X 20tpi hex head machine screw.I would drill & pin it or drill & tap the handle with a set screw that fits into a drilled recess in the shaft

Use schedule 80 pipe and you will have no problems with bending pipe. At last twice as stiff as schedule 40I have some of those that I have taken the handle off and welded a 5/8 nut on in it's place then use a wrench for the handle....
Works great for getting into tight places.... But... BEWARE.... You have more leverage and can bend pipes very easily.....
If you try to weld your original handle.... It is cast iron and the bolt is steel so the weld will be poor....
LynnW
Almost all of my pipes are schedule 80 for that very reason..... and I can bend them too....Use schedule 80 pipe and you will have no problems with bending pipe. At least twice as stiff as schedule 40