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Funny you should ask that!!
I just built my own last week... Decided to make a 12v unit that c an push/pull the 337 out. Had to work on the sproket size a little to get it just right - Used an old lawnmower tire/rim, and an electric motor from a boat lift winch...
Got about as much in the new battery as the rest of the whole unit.. It was a fun project!
Figured I could always put a 2nd battery on it and use it to jump the plane too (28v) and disconnect it for 12v tug operations..
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