I got some parts back from Commercial Machine Service and put them together to see if my design would work. Well, the addage "Measure twice, cut once" came up to bite me. Since one of the goals of this design was to make the chain sprocket center distance adjustable, the plates that mount the motor and clutches slides along the joint between the upper and lower parts of the transmission. Well, upon trying to put it together, I found that I made an error somewhere and the chain was too tight; couldn't even put it together. Luckily, the joint has plenty of material and I only need about 1/8th inch. So, after MUCH grinding to lower the shelf that the Motor/Clutch plate slides on, here is the result:
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