Bonzo is that a length of all thread out of the hole under the compressor? I was looking a that last night. I am thinking of haveing my guy mill down the AC delete pulley and replace the ribbed pulley on it with a replacement tensioner smooth pulley like it looks like you did where the smog pump went. Did you put a nut on the inside to tighten it up against the head or just put a nut on the front of the bracket and that pulls the top smog replacenet pulley and the serpentine bracket tight to the head? I have looked for a larger diameter pulley with raised lips on the front and back but so far no luck!