serial-paralel

Hello everybody :), this is the first time I post on this Forum. I want to make a modification to one of my basses and add a push pull pot to activate the serial/parallel circuit. I've already had success with another bass using a switch. This time I want to use a push pull pot (fig. 1)...

Sorry if I'm starting something that already exists, but here's what it's all about. I want to install a Dimarzio pickups and I want to connect them as follows. Pickups: each pickup coil split, series-parallel switch for both pickups on and phase switch for one pickup. Controls: blend, master...