I did the usual Internet search and a number of web sites offered suggestions. What convinced me to try Figi water was an Internet story about how NBA players really needed this water because they felt their basketball playing was improved.
The easy solution was that there were three wheels all the same in that they could be interchanged. I needed the two drive wheels to be perfect. The third wheel was not driven and it’s teeth did not matter. I just switched out the back wheel with the flawed one and the unit worked. This repair cost the customer nothing for parts, just labor.