1 Journeyman 8 months ago My amp tech has a couple of these and I snapped a pic of one. They came out of an old guitar with a large rotary tone switch as that's what they are still attached to; no idea what kind. I'd love to take a look under the cover. The poles are height adjustable and judging from what appears to be a similar diameter on both ends, I'm wondering if they are magnets and not only screws. And the blades.....curious. Fairly hot I imagine; 8.7 K marked on this one. Anyone seen these before?