Agree re above, you need to get the punched part of the stud off before you wind it out through the hub. You may be able to gind a punch to fit so you can hit the straked part back. When I did this I used a Dremel to grind them off. If the thread has had it you can drill out the hole to 16 mm and fit a press in S3 M16 type but you have to make a recess for the head, I think its 11/16 x 3/32 deep. The 16mm stud will fit most drums as they only seem to sell drums with 16mm holes now. I've done one of my hubs (one had been done so I had odd nuts on one axle) and its not a bad job, you just need a bench drill, some blacksmiths drills and some spare nuts to pull the new studs in.