In the above post, the first pic shows the sleeve through the main beam. The sleeve gets loaded up with grease when you insert the sprocket.
The next pic shows the sprocket/shaft and the retaining ring/pin. The sprocket and shaft are welded together. I could have skipped the retaining ring and put the pin through just the shaft, but I decided to use a ring so as to spread out the wear, so that the pin isn't wearing directly against the main sleeve. The retaining ring is made from a 1" piece of the main sleeve material in the pic above.
The next pic shows the inside of the sprocket shaft, which has two small pieces of pipe welded inside. The fence wires go through the small pieces of pipe, which hold the wires when the sprockets turn and keep the wires spread apart for inserting the sticks.
The next pic shows the crank handle and sprocket. They are welded together, and they slip over the crank axle shown two pics below.
The next pic shows the T sleeve welded onto the end of the tensioning rod.
The next pic shows the tensioning rod inserted into the tensioner beam, with the crank axle inserted through (the crank handle/sprocket goes onto the axle).
The last pic shows the open end of the tensioner beam.
I purchased the sprockets and chain from https://www.nitrochain.com/