I have an original Telecaster Custom. Two of the knobs are missing their set screws. I'm wondering if anyone knows the size of those set screws or a suitable replacement? Or a source for originals? These are the black witch hat knobs. I bought a set of the RI knobs - I can use those fine. But the original knobs look better and fit the aging of the guitar. I thought about just swapping the set screw over to the old knobs, but the screws on the knew knobs are narrower than the vintage one. Any help is appreciated.