Seems they could have cut away or drilled small holes around the desired thickness and saved a ton of sanding. Or scribed around with a Flint flake to get near the thickness they wanted
Where can I get a copy of that artifact book .. I live in Hayden Arizona born and raised and I come across sooo much artifacts where the San Pedro and. Gila River meet . But I would really like to check out that note book
Great question. The Hohokam crafters did score the cap and removed it. They would then turn the piece into a frog decoration. I have done this before and cutting the top off takes about equal time. I think they were using a large agave type knife.