For those who do, how did you train the use of the hook grip?
I made a thread a while back about my grip failing on the snatch. Maybe it's my comparatively small hands, but grip is seriously a limiting factor in my ability to impart force to the bar.
I've tried using the hook grip, and it causes me an immense amount of pain in my thumb and thumb-socket (I have no idea what it's actually called, where your thumb meets your palm). Mostly in the thumb itself.
More than just painful, using the hook grip has been thus far completely ineffective, because the pain makes it difficult to grip, and even when it doesn't, it does not seem to add any appreciable gripping that I couldn't have acheived on my own.
I believe there is some level of physiological adaptation to the prolonged use of hook-grip that somehow is responsible for the many wonders associated with it, as opposed to a technique you can pick up within a day and add 10 lbs to your clean or whatever.
So for those that use it, how did you train the hook grip?