I've not stoned the trigger bar, plunger, or connector before, though I've done the .25 trigger job. Is there a thread or site that gives step by step instructions on how to do some [ahem ] stoning? I did a search and didn't come up with anything relevant. Specifically, I'm wondering: 1) What kind of stone to use and where to buy the stone. 2) Techniques to 'smooth' the surfaces correctly rather than remove metal. 3) Warnings against what NOT to do. 4) Any additional instructions that are essential for doing the job right.