After trying to find local sources for handles for these wonderful old tools, I found Beaver Tooth's site, and ordered two. The detailed measurements of the handle, compared to the eye size of my old heads, made me pretty confident they'd fit. They did, with only minor reshaping to get a deep and even fit, and now I've got spares for the most used of my digging/weeding tools. A couple coats of linseed oil/danish oil blend, and they are ready for service
My single quibble is a wish that the grip area was a little fatter, with more of a swell toward the butt. Both would make gripping easier.