Cavalier camera or shirt

Good friend, you have it to do it is as Dieseltech says is to erase the mirror that is formed to the cylinder with a stone, and thus leave the surface ready for the rings work correctly, and you have to see if you need rings on measure depending on the wear and the smoke that is avie Deep burnished and so you will work better, I do not recommend the sandpaper.

Thank you thanks for your help Dieseltech –Antoniobogota-Deutz have been helpful