Postman, when you use my method it isn't so much the rock that has to be CRF as your hand. You have to train your hand to take on a sort of claw/craw-like shape which ensures good rock control throughout the 'suppression phase' of the operation. Takes years.

Daryl you can relax. I attempted to pass the technique on to a couple of passing Ockers with pretty predictable results. Mostly they just stood there looking confused. One made a sort of half-arsed attempt to give it a go but couldn't 'craw' his hand for love nor money. Eventually he became frustrated of course, (as they tend to do) and ran headlong into a tree. I lost sight of him after he staggered backwards over a bank. Sad case.