The Toro 139-3214 Spindle Assembly helps ensure smooth blade rotation for reliable mowing performance. This replacement spindle assembly is designed to support and rotate the mower blade by connecting it to the deck and pulley system. It works by allowing the blade to spin freely while maintaining proper alignment and stability during operation. By promoting consistent cutting perform... https://www.wholetoolbox.com/toro-139-3214-spindle-assembly/139-3214.html