washer not agitating

Washer stopped agitating. I removed the clothes softener cup on top of the agitator by grasping and pulling up, inside the agitator I removed the inner plastic cap by grasping the 2 finger tabs and pulling up. There was a plastic retainer assembly with spring instead of the 7/16 nut referred to in other posts. I used a long 1/2" ratchet extension to remove the plastic retainer assembly, removed the top half of the agitator and replaced the cogs, then replaced the agitator, plastic retainer assembly with spring, snapped the plastic cap back on, and replace the clothes softener cup.