Manual Steel Hub Wing Nut, Cup & Ring Set for Hunter Wheel Balancers with 40mm X 8mm Thread Pitch Shafts Many Hunter wheel balancers have a "double thread quick take up" thread design that is difficult to match. A normal thread starts at only one spot on the shaft. Double threads start at 2 spots 180 deg. from each other. The wingnut for Hunter double thread shafts has 8mm thread spacing and the shaft has 4mm spacing but it is actually 2 sets of 8mm spaced threads 180 degrees out of phase. This allows the the wing nut to start threading in 2 possible positions instead of just one. Thread spacing is the distance of one thread and one space; for example, the distance from the left edge of a thread to the left edge of the next thread.
