I got the reamers . Few of the builds I've helped with the holes for the trigger pins needed to be reamed open. I forget if it was just paint.
The hole for the big end of the trigger axis pin is so close to the bend that it is very common to be distorted a bit from the bending process. A quick touch up with a ream is often necessary on that one in particular.
For heat treating I have been using kasnit for years, it has always worked well for me. Unfortunately, OSHA made them take it off the market for some reason. There is a new product called cherry red that is supposedly a more user friendly version.
Anyway here is the process.
http://www.gunco.net/forums/163-ak-47-library/34551-heat-treating-ak-ejector.html