Because it is a royal pain in the arse! Did it today. Man what a Nightmare. Slot not wide enuff. Slot not long enuff. Redrill Control Plate holes. Took me forever. Been wanting them pesky little cheap pots ouf my Bass for a while. I have to clean them way too often for some reason. Now I have a brand new set of CTS Pots in there but I wouldnt do it again. Word of caution out there for those thinking of it. If you can pay someone else to do the work, go that route. Pics later.