I see what you mean, but as with my previous skimmer remark these four furrow 59s are a cobbled up nightmare, with multiple frames and spacers making beam mounted accessories a veritable can of worms. Looking again at that original picture of the plough the soil marking on the top right hand of the third furrow indicates that there is little or no pressure at this point. The marking on the skimmer tells a tale.Hi Was looking at the picture of your plough first picture think the problem with the #3 furrow is disc is in the trailing position not in a lead position like the rest of them . Just a observation from me . Mike