Every turntable has a pair of precision balanced abrading arms, each one operating independently. The abrading arms may be lowered or raised when mounting or inspecting the specimens. Each of the arms is precision balanced, and capable of loading 250g against the test specimen, not counting the wheel’s weight.

To raise the load to 500g or 1000g, a mount specifically for auxiliary weights is positioned along the outside of the bearing assembly of the abrading wheel. The location guarantees that the abrading wheel is concentric with the weights.