The MTD 918-06989 6.74" DIA Spindle Assembly helps support smooth and consistent blade rotation for reliable mower deck performance. Designed as a replacement spindle assembly, it connects the mower blade to the deck drive system and allows the blade to rotate as power is transferred through the pulley. Proper spindle operation helps maintain blade alignment, steady cutting performanc... https://www.wholetoolbox.com/mtd-918-06989-6-74-dia-spindle-assembly/918-06989.html