Simply put, I built a zipline through my backyard forest.
It's a boat load of fun, and was made with things I found around the house.
Like an unknown amount of Nylon rope (Heavy duty high strength)
3 heavy duty ratchet straps (two for tension, one for safety backup
One pulley from a clothesline
Some lumber I had lying around
A light duty ratchet strap for the actual connector from the handle to the pulley
And the handle. (Made from a heavy duty washer, and two large heavy duty bolts. welded together... albeit without gas.)
And lastly, a coat of stain for the platform, and a bit of oil and grease to keep er smooth.
Will have some pictures uploaded shortly!