5 gallon paint bucket
Orbital polisher from Harbor Freight
Carpet scrap
Terry cloth towel
Make sure you get a polisher that will fit in the bucket. Some have handles that are too big. Set the polisher upside down in the bucket. Decide where you want to cut air vent holes and the cord egress hole. Cut the holes.
Mark the height of the polishing pad in the bucket. Add 1/2 inch and draw a line. Mount the carpet scrap at that line. You can glue it in, or use Velcro tape so it can be washed or replaced.
This bucket will polish 8 balls at a time and makes some racket.
Optional step
To keep the balls from grinding together during polishing, I created an 8 segment divider.
I cut an old terry cloth towel into 4 strips that were 4 inches longer than the width of the bucket, and about 8 inches wide.
I folded these strips in half lengthwise so they were 4 inches wide. I sewed the four strips together at the center to form an 8-legged divider. (I used a tent awl from Harbor Freight for the sewing. Going through 8 layers of cloth is too much for a sewing machine.)
Then I cut slits in the bucket and carpet to slide the towel legs through. This creates a separate pie-wedge compartment for each ball.
I will post pics later.