I need a knob for my MC-50. Is this the normal pot, it's kinda funny looking? The short slotted post is 0.25" and the threaded part is 0.36". I tried a 0.25" wood knob for a Tele but it wouldn't go/stay on. I see listings for $50 replacement knobs/pots, but they look different. There's gotta be a different solution, no?