QUOTE(bohemian @ Nov 4 2006, 06:53 PM)

The word "bounce" always worries me slightly.Riccochet could be called a bounce stroke, but unless you're playing very fast, it's probably not the right description of spicatto. I find it much better to think of spicatto as a semi-circular stroke, with the bottom of the semi-circle being where the bow just touches the string. Practice with a metronome very slowly to learn to control it, and it's fun (well, as fun as it gets) to get someone to change the speed but so that you can't see and you keep in time. Slowing it down is a real test of technique, to make sure you really can keep it in control. You need a good bit of finger looseness, I find, for that to work.
Absolutely. Yes, it's all about allowing the bow arm (and hand) to relax. Tension will cause movement from the shoulder and the bow will lose control because it is being 'forced' not only back and forth, but up and down too, resulting in a high and irregular bounce. Don't force it. If you stay relaxed and move the bow from the elbow, with flexure in the wrist, all you will need to do is push and pull the bow - the actual bow bounce will happen naturally, on its own.
ED. With any bowing, the fingers (and thumb!) of the bow hand need to be soft and ready to 'give', just like a small set of springs. Tensely held fingers and a straight thumb result in the production of a hard tone and one that has little expression or flexibility to the sound. Softening the hand results in a warmth of tone that students immediately notice, but many still underestimate how much of a key fundamental to playing a good bow hold and arm is.