Here we present the Heavy Duty Shaft, which is a Precision Shaft that interlocks with grooves in a piece of the mat and transmits torque to it, while maintaining the angular correspondence between them. For example, a Heavy Duty Precision Shaft mounted gear may use a male arc on the shaft that matches the line of the female on the gear. The slides on the pictured drive shaft coincide with the female lines in the center of the clutch plate. A Precision Shaft can be defined as a shaft with several grooves cut into the shaft. The Heavy Duty Precision Shaft provided is very effective and useful.