i made this el-cheapo case tumbler today and it works a treat. I didnt have any walnut or corn or stainless pins.
So, i used (new) stainless nuts, bolts, screws and washers from the shed. No polishing additives the first go, but will use a dash of armorall etc next time.
All you need it an orbital sander, $15,, some liquid nails or gap sealer and a container.
Run time was under 5 min!





