This is a pic of the independantly rotating hull support with heavy duty rubber boot - this whole assembly rotates free from both the wheel and the inner axle.

Worth noting, the outer ring of this assembly has two attachment points for lines (for use mostly in the "wheels and axle only" mode). The attachment ring itself also rotates freely and independant from both the hull support and the inner axle of the Hometrax. This has some big advantages regarding the ease of securing the boat and the repositioning of the Hometrax under the boat.