My acoustic guitar's "piezo pick-up" contains a really big audio jack with about 7mm borehole. It is basically a hollow screw, fixed on the guitar surface with a nut and washer. This is much different from a computer's tip-ring-sleeve jack and RCA jack.
Fig. 1 : From outside.
Breakout of an old connector.
Internet shows very little information about this jack and generally terms as "jack" or or "guitar jack" although there are other types of guitar pickup jacks.
Now my questions are:
Does this type of audio jack have any specific name or term?
What kind of plug/ "male" jack do I need to connect this guitar to a speaker or sound system or computer?
Is there a specific circuit symbol for this type of jack and plug?
What would be the pin-out and circuit diagram for using this connector (both "female" and "male" type?)
Is there a specific name for the hollow 'screw'-like fastener?