I spoke with the machinist today, and brough him a nice 4x6 picture of the bore up close (I love my photo printer, haha). He said that I should very very carefully remove the rust there, apply some oil, and check for high spots carfully. He said to use an old lifter to check out the bore and make sure that it rides smoothly.

Also, he said that he acknowledges the problem, I proved it by bringing in the photo, and if there is ever a failure due to that problem, I'm totally covered

I like doing business with honest people. So hard to find these days. Currently checking my spring pressure and looking over my Darts on the house

Thanks alot for your help guys, looks like I finally have all the pieces.