The input hole on a Jazzmaster pickguard -- can it be used for a potentiometer?

OUTPUT. The signal flows out, not in.

If the hole is too small, you simply enlarge it with a reamer. Takes about 30 seconds, and shouldn't cost more than a few dollars, if you don't have the tool.

The alternative is to use smaller pots.
 
Depending on the pot, it's actually a little larger.

Yes it can be used.  Go Nuts. 
 
The pots and jacks I have around here all want 3/8" (.375") holes. Mini toggles want 1/4" (.250"), and regular toggles want 1/2" (.500").
 
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