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Hello Kieran,
A hardware driver such as mesa or ethercat when run will expose hal pins. You can use halshow to see the driver pins. These driver pins can now connect to hal components pins.

linuxcnc.org/docs/html/hal/tools.html
 

Not sure how the potentiometer was used but It could replace home/limit switches
(and since it's absolute no homing cycle would be needed at startup)

The encoder is possibly used for both position and velocity feedback

Is there another motion axis?

 

The machine has been incredible for 10 years. I think something got messed up with the files. I sent them to the guy that programmed the machine to see if he could figure it out. Thank you.

Does the pot have hard stops?
How many turns does it take to hit those stops, if any?
How many degrees can it turn, if it does less than 1 turn?