Get a gear on the Fisher Price

[Lesman]

Hi, our team decided to get a banebots gearbox for our fisher price and have had some trouble using it. After a long battle with the gear that is already attached we managed to break it off (chisel, heat, dremel, pliers, hammer). The shaft was still straight and it was still workig. Sadly while attempting to get the new gear on we bend the shaft running through the motor, effectively ruining it. We placed the motor in a clamp, put the gear on the end and pressed them together, we tried to keep everything aligned as much as possible but that did not work. Does anybody have a suggestion? We would really like to use these gearboxes. We do not have any sort of press (arbor or otherwise) though we could get a small one (1 ton press at sears = $88) if we must. Thanks!