Propeller Repair

Right from the tree? Rebuilding with a diameter less? build a new one? Are there any spare parts?

Image here: http://www.daio.com/DSCF3648.JPG

A new tree, a good engineer will make a new tree in a couple of hours using the old well as a model.

Can be re-turned on a lathe. Once folded well, it's never going to be as strong, even if it is heated and straightened. Get. While you're there, get a new boat. I would not go overboard in this regard.

get rolled, try a company that runs motorcycle fork right again.

The tree can be heated by oxy acetelyne recovered, but the vibration could be a problem if it is not true, but worth a try