Regarding Watermelon Threshing? in the December 2004 GEM: The watermelon thresher is actually a grinder to remove the seeds from watermelon, pumpkins, tomatoes, cucumbers, etc.
The Ferry Morris Co. of Grasslake, Mich., had lots of these grinders. Some of the grinders were for big seeds and others for small seeds.
I can't remember how the grinder worked - I was small, but big enough to pick tomatoes to run through it. They used these grinders into the mid-1940s.
1045 Village Green Dr.
Jacksonville, FL 32234