I'm not a gunsmith but I've improved the triggers on every rifle I own. I've mainly used a white ceramic broadhead sharpener. It's very fine and flat. One trick, depending on what you're honing, is to come up with something to use as jig/guide to keep the surfaces flat, perpedicular, square, etc. Get creative. I've used all sorts of things depending on what needed to be done. A phone book with the right amount of pages peeled back to let the stone ride on. A small machinist square to keep things perpendicular. And so on.
It sometimes takes a little experimentation to get things right. Hone a little bit, put it back together, see how it works and repeat as needed. Just go slow and don't change the angles of the engagement surfaces. That's bad ju-ju.
fish head
