I motorized a Corona grain mill with a transfer case range motor from a 06 VW Touareg 🙂 It’s a 12v motor with a stack of 5 planetary gearsets for some niec torque.. not too fast, tho, but it gets the job done. The hopper on the mill is made from a paint pail from Walmart.. I cut off the bottom and used clear packing tape to attach it to the original hopper. Works great and holds about 5-6 lbs of grain.