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from all the videos i have watched of screwdrive machines, i believe his pontoon screws were too small compared to the machine and components. those big ones you can see will crawl over trees !! cool machines. a t-20 would work good as a tranny on one. john boy va.
I've seen several around here from the early 1900s most are a kit on fordson tractors. The largest one Ive seen is in the mine museum in Circle. Tubes are about 15' long and nearly 4' diameter. It's built on a truck frame. Interesting ideas.