The Sherman rotisserie that was used by the IoW museum was actually borrowed from the guy that made it for another Sherman project in the UK. He posts on MLU so can make it public himself but I saw it in use and it transformed doing major work like replacing sponson plates (the horizontal plate directly above the track). A bare Sherman hull only weighs about ten tons but you certainly don't want it rolling over by itself when you are welding it so securing it after each movement is vital.
David
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