Normally in a rebuild the controller will be replaced to improve efficiency and versatility. We recommend the Comptrol Tube Bender Control but can provide and integrate any desired controller. All wiring will be replaced. Normally, the hydraulic system will also be completely replaced with new valves, tubing and fittings. Depending on condition, cylinders would be rebuilt or replaced. Safety, versatility, and ease of maintenance are all considerations of a proper rebuild.