Changing Needs in a Challenging Industry Fitzsimmons Hydraulics, Inc. can help you with your machine retrofitting requirements. Whether it's a control retrofit, equipment retrofit or an equipment rebuild, we can help you meet the challenging production demands of your industry. If you are considering a machine retrofit, currently or for the near future, please call one of our retrofit specialists to discuss the many ways we can be of assistance. This planetary geerbox is about to be modified for new use by Fitzsimmons Hydraulics technicians.