"John Gaquin" wrote in message
. ..

They may spin free when unloaded, but not under load. How long have the
sheaves been out in the weather?
That's something I hadn't thought of, and the answer is about 7 years. Lift
was very rusty and the sides of the cradle beams were flaking out (rust and
corrosion) and pinching the sides of the sheaves.