JIS drivers work extremely well to break frozen Phillips screws. I've also used JIS screwdrivers to fix partially stripped Phillips screws: Tap on the stripped screws with a JIS screwdriver and hammer to reform the head, then turn. Or even better, use an impact JIS driver. Saved my skin many times on my motorcycles. https://www.amazon.com/Vessel-125943-P3x150-Impacta-Screwdri...