TK1 telegraph key base

This is a simple base for a [TK1 Soviet telegraph key](https://www.radiomuseum.org/r/military_telegraph_key_tk1.html). Although it doesn't really provide enough weight for efficient use of the key, it is compact and portable. The base is attached with four M3×16mm nut/screw pairs.

Two versions are provided. One requires supports, the other uses a [sacrificial layer](https://www.youtube.com/watch?v=upqTE8EPZIQ&ab_channel=Breaks%27n%27Makes) above the nut hole that you can drill out after printing or simply push out with the end of a screw (I found it's slightly cleaner to push from the nut side, opposite of the final orientation of the screw as installed).