A genius elegant (vintage rare) puzzle that seems paradoxical even knowing the solution: screw the nut on the bolt.
https://johnrausch.com/PuzzleWorld/puz/holey_bolt.htm
https://www.youtube.com/watch?v=xLgjDnuuMy0
Was lucky enough to collect two copies over my puzzling time, but will let them go.
Shipping USPS domestic only, and no shipping fees! Payment thru PayPal Friends&Family only as part of the puzzle community :-)