FW, there's no screw holes in your cavity cover. How do you fix it to the guitar? (was the photo pre-screw hole?)
The little dark spots are inserted neodymium magnets. They have counterparts in the cover. I like the no screw head visible ethos.....just don’t get the relative polarities wrong cause the cover will never go on!
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FrankenLab Hand crafting guitars, because Death Rays are expensive.