The LAW-4 parts bag contains the optional Reverse One Way Rear Drive Hub for the Kyosho Lazer ZX.
This optional part replaces the LA-6 one-way drive hub and inverts the action of the one-way bearing. So, LAW-4 is locked to the layshaft, and will always receives the full drive, be it through that layshaft (taking power from the spur through the outer drive plate) or through the spur directly by the inside connection (spur friction to LA-6 with the thrust plates). It gives a 50/50 drive.
The reversed one-way also means that when braking, the layshaft ‘disconnects’ from the rear drive hub and the braking force comes from the spur-to-hub connection. In practise, this means a bit less breaking is coming from the rear.
