I had the samme prob, a 2003 MCS
, put a bookshelf from IKEA on it. Tried all the remedies only to find out that I had bent the frame. Needed a new one as the mechanism was well and truely busted. Quoted $900AUD just for the frame.......argh. Anyhow got hold of some seats from a 2007 S that were being changed for racing ones, got the trims swapped and changed the drivers frame too....it was getting a bit dodgy, so two almost new frames, my full leather, $1000 all up fitted! Bargin!