I'm replacing all the electronics in an OLP MM3 5-string. My parts bag has an EMG BTC with black concentric knobs and a couple (I only need one) matching knobs for additional pots. Seeing as I'm doing this work, I want to put in a quality vol pot such as a CTS audiio 500k. My problem is that I'm not sure that the knobs fit. The EMG site is a bit confusing, if anything I'm under the impression they're for 8mm shafts, and they haven't replied to an email. Annoyingly, I've left the gear at my workplace. Can anyone who's fitted the BTC let me know that the spare knobs fit, and if I should get the CTS with solid or split shaft. The knobs have a locking screw, although CTS shafts have no flattened edge so the fit has to be reasonably good to begin with. EMG's own pots are considerably more expensive than CTS. Any reply appreciated so I can order to minimize delay, thanks.