You did a great job on the fabrication and a great design. I've designed a few but never got around to making one. I guess I was hoping some parts would drop in my lap so I would have to buy them.

Just a thought, you might consider mounting your weights to the ends of the shaft. A simple plate with a slot across the middle would allow you to adjust the offset to control the vibration. It would be an easy way to tune the machine without having to make new weights.