I found and purchased very cheap PC switch at my local used gear store. It has 3 positions. I thought it could be used for SO2R switch.

I planned to switch head phones, CW keyers, AF out and in for PSK, RTTY or WSJT and of course microphones for 2 rigs.
2 positions out of 3, I switch HF rig (TS-480) and VU rig (IC-911D). Center position is for listening both rig AF output.

I used this swith once successfully at 6m and down contest where TS-480 for 6m and IC-911D for 2m and up.

Rear view.
A connector for TS-480 and C connector for IC-911D. Two connectors located at center are for microphones from two equipment. Snap core is good for 80m interference. Audio jack is for PTT switch.

This is a circuit diagram. Click for larger image.