Top part of agitator was skipping/not turning

First I removed the pop off cap at the top of the spiral shaped top agitator. Then reach down inside and pry off another pop off water tight cap exposing a 7/16 or 1/2 inch nut. A deep socket would probably be easiest but I didn't have one so a nut driver and luck got it unthreaded- it was pretty tight and yoiu have to hold the agitator from spinning while you unthread. Then the upper agitator asslembly lifts out and the cog assembly falls apart but it's only like 3 or four housing pieces and it only goes together one way to hold the four new cogs in place. reassemble and the machine works great again