The Gibson CTS pot's are larger and need the hole enlarged to fit. I'm looking for a high quality upgrade that has the smaller diameter shaft. (and similar feel) No Bournes or PEC. Centralab's okay. I have a 2V/1T setup I'd prefer A300k(audio) for my V's and a B300k(linear) for my T. (Don't mind the no-Load for Tone's) I have a hard time telling the shaft from pictures as I see 3/8" mentioned for the Gibson replacements. Unfortunately Epiphone upgrades are not the same as Gibson... Thanks.