Mini muffin no pot install

I have an acquaintance that is installing a mini muffin in a guitar. He is copying the original Mark Farner Grand Funk messinger guitar. The new ones don’t have the fuzz installed. He installed one with the toggle instead of the footswitch and it works awesome. He asked if there is a way to install it without the pot?

The original messinger just had a toggle switch to turn on the fuzz, no volume control, just a switch.
 
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