This 8x1.25mm nut is used to hold the side cover to the main case on Hewland and Webster Mk-series gearboxes. Because these nuts are critical to prevent oil leaks, they should be replaced whenever they show signs of damage, or if they can be run all the way down the stud without resistance from the nylon stop ring. Eight nuts are used on each sideplate. Sold individually. Replaces Hewland part number HC82013A.
Also available in a complete Side Plate Stud Kit with 8 studs, nuts, and washers (Part No. 1416-010).