[ithacaartist]

Sounds like this sear bar is a serious candidate for removal of the plunger and spring for a good cleaning, eh? Pressing out the retaining pin with a drill press sounds necessary, not only for the cleaning, and also to let some solvent in behind the plunger. Try some different solvents, too...maybe Break-Free... I'd say let 'er soak for a good long time with the pin removed. The plunger should need to emerge only enough to get ahold of its outer end in order to apply some "authority" to it. The pin is tiny, but the access granted through its hole may allow you to get an even smaller tool in there to get some movement going...