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A useful calculation for the "Major diameter" or bolt size or like you have 1/8" diameter rod stock. The first thread number is the diameter. To determine the OD size, Multiply the first number times 13 and add 60. So for your 5-40 threads, 5 x 13 = 65 add 60 = 125 or 0.125 diameter. For 6-32...

I would appreciate copies too. I'll he glad to reimburse your costs for copying and postage. Thank you. Doug Lanum 1080 Woodmere Rd. Columbus, Ohio 43220

Jim, Were you able to find drawings for the Coventry Engine? I may have a copy, but I can't access them for a while. Let me know if I can help and I will look. Doug

Thank you!

What type of torch setup do people use for silver soldering larger copper boilers?

Yes they are. An article from Live Steam Magazine and an extra drawing from a friend.

Aerostar. I have drawings for the polywog I can share. I will look for them. I'm curious, where are you located. May have an extra casting for the lower gear box. Doug