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Hi Silent, That is some very nice design work. I'll need to see how much room is in the hollowed out area in the Kingbass. I think the best plan for me would be a screw head on the surface of the plastic plate, which could be adjusted. There was something similar to this in the back of my old Hohner bass which was used to adjust the preamp. Thanks for the diagrams. Much appreciated. Cheers, Lee