In today's Ask Hytrol, we're going to discuss how to upgrade your ProSort 400's switch to the latest configuration. First, remove the hex bolt on the rubber bushing mounting bracket. Disconnect the green airlines from the fittings on the cylinder. Loosen the jam nut on the cylinder rod so that the cylinder may unscrew from the rod end. Unscrew the rubber bushing from the cylinder's base. Once the old bushing is removed, add a drop of thread locker onto the new bushing stud and screw the stud tightly into the back of the cylinder. Hytrol recommends allowing the thread locker to cure for approximately 15 minutes.