I've had the opportunity to use a few round bottom wood planes lately. I had to plane in the hollow for the wood keel timber and lead ballast mating surfaces. I really enjoy using wood planes. The next project is building the boom and mast for my gaff rigged Haven 12.5. I am looking for a hollow bottom round plan for spar making (the mast is 3.5" more or less). Anybody have a lead on some old wooden spar planes?