It works with a bottom roller drum sander on a drill press. The plexiglass guide on the bottom slides against the roller creating a perfect curve on the front of the riser block. I just cut close to the line and let the sander do the rest. The clamp came from woodcraft.
 
 
 
 

Good lookin' rig.        You're giving me some ideas to try for myself now.

Dennis

Thanks. I need to make one for the belly side now.

Lookin good Jim!!

Probably have to finish the belly side by hand/eye tho. Could get the general shape first with one I bet!!

I think if I did the belly fades 1st with a concave plexiglass guide patterned off my longbow, I could then use the flat portion of the grip with this jig for the back.

I guessed the paper thin tip would be risky,let us know how it works!!

Here is the sanding drum I use.
http://www.woodcraft.com/images/products/147975tmb.jpg

useful thing razor!
at the moment i am trying with milling machine with guide and roller.