Ok, nuff, BS. Found some nice 6061 tube and made a drawing from mine on my boat. While I was fishmouthing the breather upright tubes on my Bridgeport milling machine the hole saw adapter broke when a tooth caught. Great, now I pull out the tube notcher I never used because I just use the mill for fishmouthing. ****, the threads are different on the shaft for my cheapie hole saws. I know, I will adapt the broken part to the shaft. My lathe does not have threading capabilities otherwise I would have threaded the tube notcher shaft. Sooooo, I made the hole saw adapter fit the tubenotcher shaft. It made it a little long but some angle and good to go.