Rock Crusher For Tumble
How To Make Your Own Rock Crusher For Rock Tumblers. Rock Tumbler Rough . EASY These are small sized roughs that are intended for use in small rock tumblers with a 2 pound or 3 pound capacity barrel, such as the Thumler''s MP 1, Thumler''s A R1, and Lortone 3A.They are ready to tumble and have a Mohs hardness of about 7.