The MTD 918-04865A Spindle Assembly with Pulley helps drive the mower blade system on compatible MTD lawn mower decks. The spindle supports blade rotation, while the included 6.93-inch diameter pulley transfers rotational power through the belt drive system. This assembly is a practical replacement for a worn, damaged, or noisy spindle that may affect blade movement or mowing performa... https://www.wholetoolbox.com/mtd-918-04865a-spindle-assembly-w-pulley-6-93-dia/918-04865A.html