#68836 - CUP JOINT ADAPTER (GEAR DIFF)
A moulded plastic drive balde that comes included #68833 - Gear Differential Set 39T. This drive blade is a lower cost and slightly less durable version of #68822 - POM Cup Joint Adapter (2mm hole / Black / 2pcs) It has a 2mm drive pin hole so can only be used with TCXX drive shafts.