[ShadowKnight]

On last year's robot, we had our motor munts on these plates so that we could slide them back and forth to increase the distance between our two sprockets for each wheel, increasing the overal tension of the chain system. This can be done be putting slots (parrallel to the chain) into a plate of metal and mounting the motor, a gerbox, and the sprocket mounting devices on that plate. You would have a bolt and washers, all the usual to tighten down the plate. To move the plate to adjuct the tension, you would just loosen the bolts and slide the plate then tighten the bolts down again.