Why do Trembuckers have three mounting holes per side?

Yes, from Frank Falbo:

Re: Trembucker mounting holes

The outside two holes in the Trembucker baseplate are NOT THREADED. They haven't been for many years. I think we put the holes in there for an OEM that used it that way in the beginning. When they stopped using it that way we omitted the threading. The three punches stayed in the tooling but the threading step is eliminated. I don't think we've heard anything about it. Maybe once a year we get a phone call from someone who thinks it's a mistake.

You can definitely tap them though. Even a cheap hardware store hand tap will work.
 
I have a question.

Are the holes in Mexican made trembuckers in different spots to the ones in American made trembuckers? I think we should be told.
 
Carvin also sells 3-hole rings, or at least they used to. They are probably wider spaced than the trembucker's untapped holes. (?)
 
I have a question.

Are the holes in Mexican made trembuckers in different spots to the ones in American made trembuckers? I think we should be told.

Huh? Do you mean the Fender branded pickups? Seymour Duncan does not have pickups made in Mexico. But, to answer the question, the spacing is different.
 
I remember a story from long ago that the 3 hole setup was to do one of two things: either mount it in a regular ring, or mount it in one of those wonky rings from way-back-when that had two screw holes so you could adjust the tilt.

Something like this:

schaller-pickup-ring-3-holes-slanted-1-2-ruthenium-with-screws.jpg

Carvin Kiesel also uses 3 or 4 hole rings both with rings and direct mounting in their guitars. The tabs work well in the Carvin Kiesel rings and also with direct mounting.
 
I have a question.

Are the holes in Mexican made trembuckers in different spots to the ones in American made trembuckers? I think we should be told.

Trembucker is a Duncan trademark. Trembucker baseplates are not made in Mexico, AFAIK. There is only one kind of Trembucker baseplate.

Fender humbuckers on the other hand have 3 screws to both mount the pickup and adjust the tilt, while the baseplates have 6 holes, all tapped. Those are spaced farther apart than the Duncan Trembucker holes. Also, if internet lore has any reliability, I've read a lot of Fender's "American" pickups are actually made in Mexico also. Not sure if that's what you are referring to.
 
Mm, Ibanez did this back in the 80s especially, so you could get the tilt of the pu just right. Never had to do it, personally, as the angle of the rings tended to be cut fine so the pu was fairly parallel with the strings/pickguard, especially on a trem guitar.

The oem pu legs had three holes on the bass side, but the mounting rings were always only tapped for the two outer ones.
 
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