The MTD 918-04822B Spindle Assembly W/6.3" DIA Pulley supports smooth and consistent blade rotation during lawn mower operation. This spindle assembly connects the mower blade and pulley system, transferring rotational power to keep the blade moving effectively. The pulley helps drive the spindle through the mower deck belt, while the spindle supports proper blade positioning and rota... https://www.wholetoolbox.com/mtd-918-04822b-spindle-assembly-w-6-3-dia-pulley/918-04822B.html