Any ideas on where I can source an old main sheet block setup? Doesn't matter what boat its from...I want to use it to raise and lower my Heavy Bag (105 lb martial arts training bag).

Any sources would be greatly appreciated...my back would also greatly appreciate it. Couldn't think of a better system...pull it up, cleat it and your done. Wife frowns upon leaving it hanging in the middle of the living room. It doesn't go with her "decor" nor her color pallet (it's black and bright red)...LOL...help save a marriage...LOL