This is a follow-up to my previous post. I'm going to follow this wiring: http://www.seymourduncan.com/website/support/schematics/p-j_bass.html (thanks Nino!) However, I want to use concentric volume/volume. Sadowsky recommends that I use 250k pots for everything. Where can I find a 250k/250k concentric pot to use for the stacked volume?? If I am forced to use a 500k/500k concentric pot, what tone differences can I expect? Please keep in mind I am a newbie to electronics, and I did do a search but came up with little.