garry3: Yes, that makes sense. Bois d'ark would certainly tear up the lathe knives. Pyinkado is also extremely difficult to work with when green and almost impossible when dry. My former Scout Master was in Burma, behind Japanese lines in WWII and had some experience with the wood. Apparently, the stuff lasts longer than steel in the humid environments found there.
Yes, it is challenging to find axe heads locally. I have lived in W. TX for the past 4 years and there's certainly not a lot of trees in this area. About an hour E. of Dallas, in Canton, TX, there is a gigantic flea market covering thousands of acres, with thousands of vendors called "First Monday," which is held once a month and it draws vendors from around the nation. You can find dammed near anything there and I have seen vintage axes there in the past. I was planning a trip out there, which would have coincided with a trip to Dallas next week, but unfortunately, it is not open during the time I will be there. Perhaps I will be able to make a trip out there next summer.