: It caan also be useful to modify existing tools. Nick and I use a blockplane
: modified with a convex sole (with a blade gound into a curve) for
: smoothing the inside of kayaks and hollow shapes on the outside near the
: bow and stern.

Eric,

I have an old block plane that I want to modify for the same purposes. What radius should I aim for? Do you also put a little rocker into the sole or do you leave it straight?

Thanks, Ted