Guys with single presses won't need this at all.
Guys with Dillon Case feeders, using bullet feeders & lights on the top end of a tall progressive will have powered accessories.
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I found this quick & easy to do and the factory Dillon cord (16 AWG) supports low power devices like LED lights & bullet feeders.
Upgrading the cord to say 12 AWG (larger wire) will support the trimmer & vacuum so the switch is handy for both since normally you will have vacuum & trimmer running at the same time.
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I got some low amp LED lights off eBay and wired them directly into the switch with one switched outlet available for this machine. It doesn't have 'Add Ons' that take power, so the switch is basically for the lights.
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This is pretty easy to do, takes about an hour your first time, and I took pictures on the last one I did.
If there is any interest I can post directions...