I really can't imagine how wood can make a difference in the sound.
Listen, if y'all can't hear that maple spacers lend a woodier, more organic tone, I don't know what to tell you.
Fine, it probably makes no difference. But maple is prettier, so if I ever disassemble the pickup, mine will look nicer.
Full disclosure, I have no idea what kind of spacers are in any of my pickups.
And for the record, Gibson made p'ups considering'em as a "necessary evil" to be able to sell their guitars. And it still is, if you ask me.
/Peter
It makes me wonder why they don't just sell their instruments at a lower cost without pickups.
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What I want to know is, have any of you tried mahogany?
Seriously though, it's hard to figure how they could make any appreciable difference. Pickup makers who want to be vintage correct use 'em anyway.
When Tim Shaw was designing a new pickup for Gibson - one intended to sound as much like the original PAFs as possible - he chose to use plastic spacers. Tim knows what he's doing when it comes to pickups and these sound great; they bring a pretty good price on the used market, especially for a factory Gibson pickup.
Still, many boutique winders (including some guys who have studied vintage PAFs extensively) use wood. Not sure whether that's for any tonal purpose or if it's just so they can say they do.