The component with the lowest price in the TRANSMISSION schematic is the Washer,25mm.
A sample from the products for the Transmission include: Washer,thr20x0.95, Washer,thr20x1.05, Gear,c-2, Collar, 25x12.
With a quantity of six pieces, the Washer, 25x34 is the most used part in the TRANSMISSION diagram.