For our tree house, I wanted a winch to lift up heavy materials.
I formed a piece of scrap steel tubing into a crank.
I needed a pawl to stop the winch on the saw teeth as a safety against falling loads. I cut a snap ring groove in a pin with an angle grinder and the drill press.
And added a snap ring.
I cut a few plywood circles for each side of the drum and to enclose the saw.
I turned a drum from a 4x4.
To put a straight hole through it, I first cut it in half.
Then I cut a notch down the middle of each half, making a diamond-shaped "hole".
Then I built a frame to hold it up and put it all together. The pawl consists of a closet shelf bracket with the pin through it to catch on the saw teeth. To lower a load, you raise it up and out of the way so it doesn't catch the saw teeth as you control the speed with the crank.