hey, i recently purchased a Parker P-42 traditional and Im loving it, just needs pickup upgrade. What does spacing do, like it says:

spacing: 50mm or 53mm

conductor: 4 or braided 2

coil: potted or unpotted

leg: long(1/2") or short (1/4")

what does all this mean! and will it still work with my p 42 if i choose something different or is this stuff just preference?

please help and suggest setup options please