And now I turn to balancing those wheels I made before. I decided that I didn't want to drill holes in the wheel. So instead of drilling holes in the heavy side, I added weight to the lighter side.
I drove screws into the pulley on the lower wheel. As I got closer to the balanced weight, I switched to smaller and lighter screws. Once when I put a screw in that was too heavy, I backed it out and put a smaller screw in. Not quite as ugly as a bunch of holes, and the pulley is held on better now.
And I forgot that I had picked up some inner tubes to use as tires. A 14 inch inner tube on a 16 inch wheel stays put pretty well. So I put these "tires" on the wheel, and checked the balance again.
The top wheel was in better shape. It only took a few screws to balance.