Have a guy that wants to put holes in this 16 lb. ball. He has no drill sheet and I am concerned if this ball was designed to be actually bowled with. I have no idea the maker, the cover, or the center of this ball. Does not look like a Bruns viz-a-ball make-up. The ball is black with 1997 Collector Series engraved in white ( this is the heavy spot with 3 oz. top weight) and above that NASCAR logo in white and Racing in red. Serial no. is 73TF1399. I assume with some top weight this thing can be used but would like to know for sure before (in my opinion) ruining a valuable collector item .      Thanks, Alzgarvin