I'm in the process of rebuilding the cutter bar assembly because the cutting action was poor (clumping and uncut grass). I'm attributing it to poor clearance between the cutters and ledgers. From the manual sheets available here: Cutter bar and outer shoe assembly page 10. My question is in regards to the inner knife clip (18) and the inner knife shims (21). It looks like there's another component in the diagram that isn't labeled. Is it another spacer plate similar to (5)? The quantity for (5) is only showing 2 though. I'm not interested in your opinion about types of cutters, or type of forage. Just a specific answer about the components. Please. Thank you!