I saw a bowler scuff a ball by hand with sandpaper the other day. This guy is a fairly good bowler with 223 avg on THS. I didn't ask him because I don't know the guy and he was isolated in a corner of the house long before league play started and it looked as though he didn't want people to know about him doing that.
My questions are:
1- Is this legal?
2- If it is, how reliable is it? I mean, it's not easy to duplicate so that it produces the same effect each time.
3- How often does it have to be done to maintain the same performance with the ball?
Of course, if it's not legal, I wouldn't dream of doing it.
Martin