Originally Posted by Warin
If you want to reduce that friction loss then
rotate the D shackles in the photo 180 degrees - so the webbing slides on the flat bolt surface rather than the curve.
Get some metal tubing that goes over the shackle bolt ... now what ever have the less friction will rotate. (Problem - the webbing will tend to go to one side
The use of this pulley system assumes that you have something to anchor too. If you don't have one of those you are back to a dead lift.
I don't find much difference between the polished stainless shackle and bolt in terms of friction, using the climbing strap.
If you are using cordage (up to 3/16"/4mm), Ronstan has introduced a new "Sheaveless Block" called the SHOCK
that is extremely compact and light. Safe working load up to 385 lbs. Very clever, though I prefer the nylon climbing webbing
, which has a 2,000 lb working load.
Around here there's usually a tree or rock to anchor to: YMMV.