1 Gregory_Pecarry 12 months ago I have a Silvertone 1427, which is almost the same as an H63, Espanada or Harmony H62. It has P-13 pickups which are a pre-curser to P-90s made by Gibson. Only appear on a few Gibson guitars for a couple of years but Gibson supplied Harmony with them and they appear on some 1950's archtops.I've watched some youtube videos such as this: and think its out of phase sound would be great to have available but it's not currently wired for that.I took it to my local tech today and he said the wires make that difficult. The ground is an exposed, hollow braided wire with the shielded lead in the center. And switching lead to ground and vice versa poses problems. I found some photos of a P-13 opened up and it doesn't appear that trying to flip magnets would be an advisable solution especially in a 57 year old pickup.I'd prefer to leave the existing wiring of pickups, switch, caps and pots as unmolested as possible, imaging a switch accessable through the unbound F-hole.Any input from folks with knowledege of making this kind of mod in a vintage guitar without doing anything drastic appreciated. Thanks.