Something else to take into consideration. Not all 500K pots are the same value. When you hook them up to a meter you may get 350, 410, 515, 434, 521, ect. I just recently bought 3 500K CTS pots and they were all below 500K, most were around 420K. I took then back to the music store and traded them for 3 more. This time 1 was 501K, another 508K, and one was 448K. I used the 501K and 508K. I hope this helps.