Frank as far as the drive shaft is concerned I am not sure about the cyclops shaft. I have a 1641 also and have never taken a close look at it as far as O.D. dimensions are concerned. Yes the 682 had the rag joint style shaft in it. The O.D. of them shafts are 5/8th which is the same as all the gear drive machines also. I used the coiled spring pins used in a gear drive shafts to pin them together. The pin diameter is 1/4in. I will be using the other half of that 2185 drive shaft in my 125 on the flywheel end. Any more questions I will be glad to help. Good luck with your retro fit.
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1641, 1541, 682 with 18hp command engine and hydraulics from a 782. 1872 with a power angle blade.
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