I understand this is available now, but I couldn't find it in the online store yet. So does it come on its own, and we just throw away one of the volume pots, solder, and put the original knob back on? Does it come in a kit with a set of four Dingwall-style replacement knobs? Does it come in a kit with a replacement volume pot (I understand from the other topics that the original vol pots are optimised to work together, and that when we put it a 4-way switch we should replace the vol pot with one that's optimised to work with it?) How much does it cost?