If I had a ring set like that, I would assume that someone has tampered with it and I would use a whole new set. If the rings are the correct size, you should not need to adjust the gap at all.

I wouldn't worry about your scratch and honing etc.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!