I made a wind powered rock tumbler so I can make sea glass. Se my previous videos on tumbling glass using conventional tumblers along with my tests of dry tumbling glass.

Rock and Glass tumbler videos
   • Making SEA GLASS with a rock tumbler  

McMaster links
McMaster is expensive but good for prototyping because of how well organized the website is. I started with this shaft and then searched for pieces that would fit on it
https://www.mcmaster.com/1346K19/

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For additional projects and information check out our website:
http://www.homemade-modern.com/