Alan love the block idea and the shackle. I would think that even a small shackle might be too much weight. So possibly grinding it down to half thickness might be an idea and go with rare earth magnets. I am partial to nautical fare, I have a 14k gold shacle earring that I wear. Probably overpaid onebay but I just had to have it. Now to go with block and tackle from belt to kilt pin for the salty ladies who want to do a kilt check...