A modular joint prosthesis includes a nail for insertion into a bone marrow canal, the nail having a nail neck. The fuel additive comprises a composition of olive oil and fuel oil in a ratio, by volume, of about 1 part olive oil to about 8 parts fuel oil. Each side member is arced inward toward the imaginary center axis. The SMA lockdown is configured to provide a lockdown for the MCP in the housing. First brake releasably holds the carrier of the third gear unit against rotation.