Greetings, I have a Granite 3S BLX 4WD and had to replace the slipper plate/spur gear assembly. The slipper clutch maintenance set (ARAC9103) comes with a small threaded cap that fits into the other side of the slipper plate hub set to secure the assembly. However, with that cap in place the completed motor unit does not fit into the gearing going to the front wheels. Can you assist?