Re: s1 switch to put 2 humbuckers in series out of phase?
If you look at most Jimmy’s Page wiring diagrams, you would be just combining the phase and series switches onto one big 4PDT switch. Same number of lugs involved and same wiring. If you have HSH, then you need to ensure you have a pickup selector scheme that puts the bridge and neck on at the same time, or you might not hear anything or hear any difference.