After taking out and studying the Pioneer Master Service Manual and looking up the 1073 and 2073 there is no separate stud number listed for these saws, that would mean they must come integral with the right side saw case, in other words they seem to be non replaceable. A lot of the Pioneer horizontal cylinder chainsaws had replaceable bar studs but the case halves had to be separated to change them, these saws have separate parts numbers for the studs and the nuts. Broken off bar studs are rare, I can only remember seeing one come my way and it was on a model that was replaceable, the 1130, for that saw the bolt/stud part # was427659.
If one can be welded on that would be the next best route to try.
Pioneerguy600
If one can be welded on that would be the next best route to try.
Pioneerguy600