OK, thanks. Will look into the RAB clamp. Re Head Radicals, have hit with them quite a bit, as they used them quite extensively at my club as the stock ball for group classes and hitting sessions. My personal impression of them was not favourable. They didn't feel like a genuine top tier offering, flying uncontrollably off the racket at first before quickly adopting a spongy quality quite unlike other balls. The club stopped using them. 0830 start if I'm not mistaken, so you would be odds on to miss the business end!