I would lock the front, the adjusting end of the box frame with these http://www.ebay.com/itm/Pair-Mountain-Bike-Bicycle-Wheel-Hub-Skewers-Quick-Release-Bolt-Lever-Axle-NEW-/121388397074 All you need is a solid washer cut to the same width as the inner channel which would provide resistance for the clamp and prevent frame deformation. $.99
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