In article ,
Fuddy Dud wrote:

Everybody sells 3.5mm plugs but nobody sells 3.5mm jack that you can
mount and solder wires to. Is there a source? Most dealers don't even
know the difference.

I buy these by the 100 and use them frequently. Not really esoteric.
Even have a customer-designed product that I had to source a jack with a
small-pattern mounting nut to fit a machined pocket. It was about .010"
smaller across the flats than the ones I'd been buying.

Your use of "everybody" and "nobody" seem a tad hyperbolic.