The Toro 107-8501 Lawn Mower Spindle Shaft Assembly helps support smooth blade rotation and consistent cutting performance. This replacement spindle shaft assembly works within the mower deck to support the blade and transfer rotational motion during operation. Proper spindle alignment helps maintain stable blade movement and even cutting. Replacing a worn or damaged assembly can help... https://www.wholetoolbox.com/toro-107-8501-lawn-mower-spindle-shaft-assembly/107-8501.html