I've had a similar problem with a clamp. I have the five tooth and the machine is almost two years old. You know how the clamp "locks" down? One of mine does not do this, rather it just squeezes the string and does not allow it to slip. It works fine, but I continue to worry about slippage because it never locks.
I've been debating on whether the three tooth are an upgrade. I thought about just buying two of those. Any thoughts there?
I am going to win Wimbledon one day -- even if it is the over 40s doubles ..." Goran Ivanisevic