Axel for OpenBarbell V0.24 Bryce.
The Axel is what keeps OpenBarbell together. It facilitates the rotation of the encoder as well as the spring, which allows the retraction of the kevlar string. The Axel is flattened on each end so when it is inserted through the Spindle Encoder, the encoder wheel will not have accuracy-killing hysteresis. It is also slotted at the end to accept the spring, which is anchored to the OpenBarbell housing as well. The Axel may be difficult to manufacture with a laser cutter or 2-axis mill because is cylindrical.