When my AC Compressor seized at the end of the summer I began looking for options. This bypass pulley was just what I needed. Went to the hardware store got shorter bolts, went by the local service station to drain the Freon, removed the old unit and installed this pulley bypass right in its place. No more grinding metal ringing under my hood. I'll address the The AC issue next summer. It's a long cold winter here in New England.