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voltage drive plate. Additional upgrades that are not directly associated with electrical performance were Recent performance and reliability upgrades to the introduced to improve reliability and maintainability Dual Axis Radiographic Hydrodynamic Test (DARHT) during lifetime operations, which includes hermetically facility second axis induction cells have impacted various sealing the water-oil interface joint in the solenoid, cell mechanical components. To attain a higher level of improving the ventilation of the oil cavity to prevent performance and reliability, key mechanical elements overpressure, and incorporating a detachable bellows comprising the induction cells were redesigned. These assembly. These upgrades will be implemented on eighty elements include the oil-vacuum insulator assembly, cells in a quality production process environment that cathode cap, oil and vacuum region cell extension promotes assembly repeatability which leads to reliable hardware, induction cores' insulating material and cell performance. configuration, and the high voltage drive plate. While developing these upgrades, other enhancements, unrelated Oil extension spacer to the electrical performance, were implemented as well.ring These enhancements include the solenoid assembly oilwater interface, the oil plumbing and ventilation, and the ----=-High voltage plate vacuum bellows assembly. Mechanical processes were also developed to attain high assembly quality during the cell refurbishment process. This paper presents and discusses each mechanical attribute associated with these Core insulating sheets upgrades of the DARHT second axis induction cells.Oil-vacuum insulator assembly