Best switch (killswitch)

[SGD Lutherie]

This is listed as single pole/single throw

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[mjl9787]

Smallbear sells both momentary and non-momentary spdt switches in a couple different sizes, and also pads to put on the lever part for grip. It won't be as big as that Les Paul pickup selector, but it'll last longer, be way cheaper, and be functionally better for what you want to do with it. I wore out the pickup selector in one of my guitars pretty quickly doing exactly what you're wanting to do.