I would like to publically thank Mike Tucker for enlightening me. I have only had to work with the feedscrews on my very early machines and never looked closely at the later feedscrews. Mike suggested I get a USB microscope for my computer. It arrived last week and I began to look over later feedscrews. They certainly are 60º feedscrews. Now the question is when did Edison change over? The 1892 Class M project machine of mine had buttress and examining an 1896 Spring Motor it was the same. Looking at a Triumph B, C, D, E, F, & G the feedscrew is 60º threads. That will teach me never to take the later machines so lightly ! ! ! This just goes to prove what I have always said, "You are always learning something new about Edison machines." The fun never stops. A big thank you to Mike. Regards to all, Al
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