Greg,
I have a little metal cup. I think it was a votive candle mold(shhh don't tell the wife). I fill this with vasoline and place on my monocoat iron. The iron is proped up horozontal and inverted. I dip the knuckle of the hinge in, then bend the hinge the other way and stick it in again. The excess vasoline is wiped away with acetone, so it does not prevent the glue from doing its job. By liquifing the vasoline you get it down inside the movable part of the hinge and away from the glue surfaces.

Dan P