Never noticed the tumbler thread before sounds like it might work fine, I did not see very many before and after pics but I might decide to go that route over the buffers. The only thing I'm not sure about is how well it would work on water stains and other various blemishes. I will be sure to leave the Simmons for last. My Norton 1-4-8k get here soon and I am looking to practice on a few blades and it would suck to damage a nice one. But my screw ups keep the people who restore in business.