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FOR EVERYBODY'S INFORMATION: I had this exact problem of a loose pulley (as described above and as seen in the video). Instead of buying a new pulley, I took a long shot and simply bought a large washer (as in nut, bolt and washer). I took off the pulley nut, inserted the washer and the washer served to "fasten" the looseness of the pulley. Is working like a charm for 50 cents instead of $40. Hope this helps somebody.