(PDF) Hipparchos vs. Ptolemy and the Antikythera Mechanism: Pin-Slot

pin slotSlotted spring pins are headless cylinder shaped tube with a slot that runs down the middle of the pin. Slotted spring pins are also known as tension, roll, and expansion pins. They are to be**• Slotted tooth spring pins** - Slotted tooth spring pins have a zip-like desn with staggered teeth which interlock when the spring is compressed. This ensures roundness of the pin