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John, a coincidence, just sent an email saying hello. Was this cylinder leaking badly before you brought it home? If you polish the pits on the rod cylinder with some emery cloth (like the shoe shine fellows from the old movies) and not leave any protrusions. It would probably work. If the unit sat for 4 years, some of the internal "O" rings in the helm pump are probably brittle. Chances are the front unit needs work.
Unfortunately, now might be the time to look into a matching helm pump with a new cylinder. If it sat with oil seepage, the interior walls of the cylinder casing may have rust from condensation. Need to purge the system. Once contaminants are in, tough to remove. Sitting is death on these things. Bad oil could ruin a new cylinder.
Garris