I'm sure jigs and fixtures are worth their weight in gold.
That said, if you buy a small pair of needle nose vice grips, grind the jaw that holds the handle so that it doesn't mark it up, and radius the one that goes into the bolt body, you can use your action to fixture the location. This way you kill 2 bird with a single rock. It'll allow you to tailor the primary extraction to the receiver as you position it.
I can tig/time a bolt in less than 10 minutes this way.
Seriously, save your sheckles and buy a $15.00 pair of vice grips. -the exception being the clever feller that made the threaded plug to come in from the backside. Pretty cool idea imo.
Good luck,
C.