Building one as we speak. I am using a hand winch that I got from Grainger. It is good for overhead lifting 1,000 lbs, and it is reversable.
One Swivel Pulley (1,000 lb)
One fixed base pulley (1,000 lb)
Rope to "sling" the top to the hoist.
Mount the swivel pulley above the top, wrap the top in the rope sling. use the fixed pulley to mount the hoist where you want it.
YOu will need a few eye bolts and lag head bolts.
So my hand winch is mounted about chest high on my garage wall. The cable runs up the wall to the fixed pulley, then it heads directly over the top, passing though the swivel pulley. The cable then runs down to a bow shackle that connects the winch to the sling. 'Bout clear as mud isn't it.
I know everything is over built but it was cheap and I would like to over build when possible. plus block and tackle was hard to find locally for me, and grainger had everything in stock right down the street.
I will post some pics when it is done.
Rezarf <><