Had two go bad, switch and/or wire problems so I made a heavy duty model. One tire valve with all the rubber cut off (threads are correct for 901), 2" model airplane fuel line inserted in the valve, 2 1/4" copper rod inserted in the fuel line for the positive contact, soldered heavy duty push switch to the valve, soldered heavy duty USB cable to positive and negative. Negative is the casing with the threads and switch. Wrapped it all with electric tape and wow I now have Screwdriver USB.



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