Just got a couple sets of RNT II chop cup balls in the mail yesterday. You'd be amazed what these balls will do for a cheap chop cup! I now have a set of balls, along with a backup set, that are adjusted for the brand of cup that I'm using. Each set consists of two gaffed balls, that are fully adjustable. All you need is a pin and a jeweler's phillips head screwdriver to adjust them in a minute.

Another thing that I like about them is that they're available in several sizes. I like the ones that are golfball size, for standup work. I understand that some are available that are even bigger than that. I got mine in white - the color that Don Alan preferred. The large balls aren't on the RNT II site, yet, but just send an email to them and they'll tell you what's available.

For $16.00 a pair, you can't go wrong.