The biggest test of your wheel head shaft is to turn it lose on a big pot potter Like Scott Semple. Scott throws pots on over-sized bats that are over 6 ft tall. When you get that much clay, cantilevered out, that high…it puts a tremendous amount of stress on your shaft. Before Scott bought a Skutt wheel he actually bent a few. The shaft on a Skutt wheel is nearly twice the diameter of the competition.