Kong got 3 of these two pin under ring, one with a targeting weight hole, it was suggested by one of my driller's who is buddies with Bill Hoffman. Ball revs up in the mids and never overreacts to dry boards, it was supposed to be an oiler but the cover are like diamond hard to cut down.
For medium oil the Big Kahuna got 3 of these also, one pin up and 2 pin down with being highly polished.