on the agitator but only a sub bowl inspection can prove that. I've never come across a Simpson that doesn't have a 2 speed direct drive gear box for the agitator and the spin dryer. Source(s): Electrician, Electrical Contractor and Appliance Service person for 50 years. Other Answers (4) Nope. It's just a 2" (or so) threaded bolt that goes into the end of the agitator shaft. Remove the bolt and lift off the agitator. Note that it may be a little difficult to lift the agitator as they are usually installed and never need removing.