Old man 43 is my birth yr. I use the switch on the (-) the brass casing with the thread, solder one terminal of the switch directly to this casing and this holds it firmly, the (+) is just a covered wire pulled thru the case filled with silicone but you can also use small rubber/plastic tubing instead of silicone. As a positive contact a glob of solder works and a small spring even better. Your usb cable has a red and black wire, connect the red to positive and black to yhe switch.
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