Looks as if the nut itself had a screw seal outer profile. My guess would be for water or air proofing or space age nails haha. Any and all inquiries, thoughts and hypothesis are welcomed! Thanks, Beau Johnson
- dreamer
Looks as if the nut itself had a screw seal outer profile. My guess would be for water or air proofing or space age nails haha. Any and all inquiries, thoughts and hypothesis are welcomed! Thanks, Beau Johnson
- dreamer