You need to chase a ring full length of your bow.
To help get a good light source and some cheap dye.
The light is key but adding a rub or two of dye around the area you are working will make the rings jumps right out at you.
Tools - you need a very sharp cabinet scraper and 60/80 grit sandpaper.
Post pics and people will help you get a ring chased - it really isn't hard when you get the knack. 7 rpi isn't going to make it impossible.