AH218548 Adjustable Hold Down Clip Fits John Deere Combine Platform 600F 600FDOne New Aftermarket Replacement Adjustable Hold Down Clip Fits John Deere Combine Platforms This high arch adjustable hold down clip (also called a sickle hold down or knife thumb) secures the sickle bar and minimizes vibrational movement of the knife in the double finger openings of the cutter bar on Fits John Deere 600, 700, and 900 series grain and draper platforms. It mounts to the header bar via two bolt holes and is a direct replacement for OEM