Wow, so this bow could actually be worth something? As for the riser, I don't think it would matter that there are a pair of drilled and tapped holes going into it, as all the paint has long since been worn off the thing and I could easily screw in a threaded plug into the holes if I had to. I only did that as a last resort and was unable to find any sights that would mount in the original holes. Long ago it had one of the rectangular sights with five pins you could tighten or loosen with a nut and slide vertically.