AZLOGGER's Procedure For R&R Husqvarna Bar Studs.
1. Remove oil reservoir cap.
2. Drain all oil out of reservoir.
3. Secure a piece of small thin wire to the threads of old bar stud. Just like formersawrep said.
4. Strike damaged stud on threaded end with hammer, popping it into empty
oil reservoir.
5. Extract damaged stud from reservoir by means of a magnet or long nosed
hemostat.
6. Remove small thin wire from damaged stud.
7. Paint or scribe a vertical line on new stud corresponding to
narrowest part of rectangular head of new stud.
8. Secure small thin wire to threaded end of new bar stud.
9. Pull end of wire from outside of bar stud hole in case (gently).
10. When threaded end of stud protrudes enough thru hole, against shoulder of bar stud, remove wire.
11. Make sure line on new stud is completly vertical to case prior to pulling stud into place, if not correct, rectangular head will not fit into rectangular cavity inside saw case.
12. Check inside case with flashlight to determine if bar stud is installed correctly into rectangular cavity. IF ALL IS CORRECT CONTINUE.
13. Install bar and chain.
14. Install oil reservoir cap, fill with bar oil, & go cut some wood.
Steps in blue are helpful hints!