Has anyone built a 4 wheel rowing machine? Some time ago I acquired a "Kick-N-Go" scooter that has what I would describe as a lever that you pump up & down with your back foot to propel yourself. While I haven't taken it apart yet to see how it works, it seems to me that instead of stepping on the lever I could duplicate the action by pulling it repeatedly with a cable. This would be different from the traditional "Irish Mail" where the handle that propels it is always in motion. (Sometimes you just want to coast without moving your arms back & forth.) I am open to any ideas anyone has about building one of these.