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| + | [* red] The only thing now preventing the two frames from being separated is this gear. |
|---|---|
| + | [* black] It is fixed to the shaft with a taper pin. |
| + | [* blue] A taper pin is a pin that tapers from a wide end to a narrow end used to affix parts onto a shaft. The machinist would put the gear on the shaft, drill a hole, then taper the hole by using a tapering reamer. Then the machinist would put the taper pin in, give it a few gentle whacks with a hammer, and grind off any end sticking out too much. |
| + | [* icon_note] Taper pins were better than set screws because a taper pin leaves no possibility for the parts to rotate. |
| + | [* icon_note] They're also a ***pain*** to remove after 90 years. |
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