This part number matches the current model number 1926
Part #791-145569
The anti-rotation screw attaches to the lower handle clamp. This item is priced individually and is made out of metal. It is a genuine replacement part used in compatible tillers, trimmers, and blowers made by Ryobi, Troy-Bilt, MTD, Bolens, Yard Man, Yard Machines, and Cub Cadet. A torx screwdriver will be needed during the installation process. It will need to be replaced if it becomes stripped or broken.