surfboard script

I'm looking for a working surfboard script (full perm, or at least copy + trans) that still works. I have one that seems to be broken following the changes to the physics engine - the board now floats under the water not on it, and when you fall off it catapults you to the edge of the sim. Not good. I just need a new script that will float and steer properly and not do the catapult thing. Does anyone have anything that will work?

I'm having the same trouble with all my boat scripts, making the boat float too low in (or just under) the water.