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Re: 1557's gearboxes
Team 1726 did the same thing with our transmissions, and I believe a lot of other teams did the same thing, too. It's simply a matter of flipping the aluminum (output side) plate of the Toughbox over, so that the output shaft can sit where the idler shaft used to be. The only modification that needs to be made is that the output plate needs two new clearance holes for the motor shafts so that they will fit (easily done with a drill).
I asked Andy Baker about it, and he said it wasn't an intended modification. It sure was nice of him to make those gearboxes symmetrical, though!
Oh, and the new reduction when you do this is about 3.57:1, if I remember correctly. Attached is a crummy picture of our set up...
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