I'm installing Keystones and a 4-way Oak-Grigsby switch in my CVC. Not only did I wire the switch as per the diagram from the AcmeGuitarworks site but it's also wired exactly the same as the one in my MIM which is also identical to both that Acme diagram and the one from the Seymour Duncan site. The continuity of the switch checks out as it should when it's unwired and removed but it's when I install the switch and wire it that thing get very strange. In Pos.#1 the neck pickup is still engaged in parallel with the bridge just as it is in Pos.#2 which is functioning as it should. Pos.#3 which should be neck only appears to be bridge/neck in parallel as well but the bridge output is diminished. Pos#4 which should be bridge/neck in series is neck only. The resistance readings on Pos #1-#3 are all the same as if they were bridge/neck parallel and Pos #4 reads just the necks resistance. None of the positions give readings of bridge/neck in series. The wiring is all correct and checked so many times I have it memorized and there is no contact of wires, jumpers or solder to the wrong terminals. The pickups are each grounded separately to the pots and the jack sleeve is grounded to a pot as well. The shielded cavity is also grounded. If there is a Dr. Gregory House of Telecasters, Keystones and 4-way switches around would you care to offer a diagnoses? Seriously I don't have a clue and a fellow member who had put a number of them in his own guitars is just as stumped as I am. If anyone wants to take a shot at a solution I'm all ears.