HT-1 Visual Fault Locator FC Adapter

This is an adapter to provide a threaded keyed mount for FC connectors on the HT-1 Visual Fault Locator.

I wasn't able to find an adapter to buy for this specific type of light source, so I looked up the FC connector spec and guessed at the VFL thread.

The threaded part the FC connector mates with is pretty thin and weak, maybe print some spares?

For a properly reliable mount, I'd suggest machining the adapter out of steel or brass.
A drawing+STEP model is included with the critical d