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I'm finishing up CAD models of Elmer's Rope drive engine & generator & can't get my head around the belt drive. How does the belt tensioner work? I think this uses 6 belts (Rope) off the engine flywheel & maybe a 7th that comes off the jackshaft (?) & runs to the idler pulley. I just don't understand how this 7th(?) belt keeps tension to the other 6(?). I understand how the weight provides the tension, but what belt or belts are ran through the idler pulley? I did a search on the web for this engine & found a video by Marv K., but it's hard to tell the routing. Maybe Marv can help me out... Very cool engine & set-up with the gen. I'm surprised there haven't been more builds of this...