Mercury Screw - 10-8M0129201. The Mercury Screw (10-8M0129201) is a genuine OEM replacement fastener engineered for durability and precision. Designed specifically for use in Mercury and MerCruiser engines, this screw provides a secure fit and corrosion resistance ideal for marine environments. Whether you're performing a routine fix or a full engine overhaul, this part helps ensure long-term performance and structural integrity.. Key Features. OEM Certified - Manufactured by Mercury to meet exa