Nobody would think they were functional. The metal is so thin that the pulley will sag even if it's abutting the tree from below. The screw is above the roller so the head of the screw will cut into the wood underneath the crate. I lifted the back of the roller to prevent the box from rubbing, only to find that the roller had so much play from side to side that the box fell off the plastic. Our originals have lasted over 30 years. I've lost all faith in a foreign production. I am a 56 year old female with a technical background. come on guys It is a pity!
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