Twist the shaft and two nuts travel in opposite directions along the threads. The spiral geometry guides each nut smoothly along its path, and the knurled edges of the rings give your fingers something to grip.
Spin the rings and watch them slide back and forth, following the thread with satisfying resistance. The right-hand thread pushes one nut forward while the left-hand thread pulls the other back, creating that mechanical push-pull motion. They move the full length and stop when they meet.
Spin the nuts while you’re thinking, roll them back, spin them forward. The motion becomes a reflex you don’t even notice you’re doing.









