Thanks PJs! I'm not sure what you mean by the big O ring. I think you are talking about the 1/2" rod ring that the upper rollers are attached to. That I rolled on the the big HFT Tubing roller. I should take some pics of it as it's also handy as a shirt pocket. It of course has been modded to do different stuff. I'm learning from you and Paul's excellent builds how to take pics. Unfortunately I never think of that until after I'm done.
The coupler was this solid cull belt drum I cut in half. For those who have not been around fruit packing equipment it's a narrow 4" wide belt that carry's away the fruit that either too ripe or damaged to go to market and is called culls. My father in law used to make packing house equipment and had various parts laying around. So I picked up the set. 2 x 1" shafts, 2 x 3" drums and 4 x 1" pillow block bearings.
One shaft and one pillow block are what the drive is connected to. I cut the drum in two and one end I welded 4 angle irons radiating out to be bolted into the plywood stiffener on the bottom of the plastic 55gal drum. The other half of the drum was turned into the coupler for the HFT pipe threader. If there is any interest I could pull off the tarp and try and get closer pics of the drive and the front suspension.

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