Just drilled up my widow maker with a dual drilling of 65x5 1/4x40... One thing i notice diffferently with this lane master ball is that it keeps the pins very low and pushes the pins side to side instead of straight back..I've only practice a few games with it,but it seems to enjoy carry down and that will make any bowler love that..I will report again with you with an update,after next weeks league trial.....