The lead screw in mine was hollowed out so that the gearbox shaft could fit inside of it. This lead to the shaft getting bent eventually by impacts. The gearbox itself didn't suffer any damage, as the lead screw sat against a bearing and nylon spacer. If the gearbox had a large enough output shaft, it might be ok, but I would recommend using an indirect approach instead of doing what I did with the direct gearbox connection.