Here's the tiller lock, john
Here's another Canadian tiller control: the Tillerlock. It's just what john's describing, but from a different manufacturer. (Or maybe they changed its name due to confusion with the autopilot?) It's a simple cam, operated by a lever. You just flip the lever foreward to lock the tiller; backward to release it. Much simpler than the Davis Tiller Tamer, and looks like it will be more durable (all-metal construction) - I've seen a few comments on this site about TTs breaking. Costs about $33 US.I have one of these, have been using it for five or six years on two different boats. I love it. I can't imagine why West and the other marine stores don't carry this: it's a wonderful device. Right now, you have to mail order it from the site linked below.The only reservation someone might have: it has no intermediate (friction) setting between locked and unlocked. I've seen some people posting that they want this. Personally, it's not an issue for me: I've never wanted to 'slow' the tiller, only to have it locked in place (for example when raising sails) or running free.