Modifications include Seymour Duncan SHR1N hot rail, and SH4 JB humbucker. The knobs have been taken from an Ibanez Gio Bass. Over the years, the screws that hold in the strap pegs have become stripped. I once had super-glue in both of them, and when that stripped out, I just power-drilled a wider, longer screw inside. Hope that holds.