I found that the wires can make a complete circuit. Speaker covers unscrew, short cable side wire is able to carry +, tip of jack. Drill into both brass plates, tap 4-40 1/4" long screws. Installed earbud, maybe a small speaker later. The - goes from there through to other earphone. Drill, tap and made jumper. The long cable goes to - on jack. Burn off wire coating about 1/2" on wires of + & - earbud cables to wrap around screws. Female mono jack + bent in to make contact, filed out hole a little to fit. Only one but it works.
Faltesek
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US
US HS-18 Headset
(2017-07-06)
A great reproduction for the M38. I'm all set for a WW2 re-enactment coming up later this year involving lots of allied armor.
Faltesek - US