The design is often criticized for its tendency to cam out at lower torque levels than other "cross head" designs, an effect caused by the tapered profile of the flutes which makes them easier to insert into the screw than other similar styles. There has long been a popular belief that this was actually a "deliberate" feature of the design. Evidence is lacking for this specific narrative and the feature is not mentioned in the original patents. However, a subsequent refinement to the original design described in US Patent #2,474,994 describes this feature.