Mercury - Morse 33C Cable Adapter Mechanical Control Conversion Adapter 82779. The Mercury Morse 33C Cable Adapter is designed for converting a Morse 33C-style mechanical control cable to work with Mercury mechanical throttle and shift control systems. It allows the cable end to interface correctly with Mercury control hardware, making it a practical solution during repowers, control updates, or service work on older mechanical installations. Once installed, the adapter supports proper alignment