These are common to break and a lot of the scrappers are wise to it. I have been asked £15 for one mechanism before from a local scrapyard (when I first got the car). Now whenever I am in a few breakers I know I always pick any up I can, the mechanisms are usually worth £10 all day long (and of course it helps to have a spare around). So, the price in Cable's posts isnt mercinary, its pretty much spot on.