Perhaps a more important question: what's wrong with it that requires disassembly?
If you can describe the problem, maybe someone here can suggest an easy fix.
If there is no problem, and "rough condition" is mostly cosmetic, I'd say just give it a good cleaning (no disassembly needed) and wipe it all over with a slightly oily rag to protect the finish. If there's any rust, you can scrub it off with bronze wool (less aggressive than steel wool) before oiling.
Is it mechanically bad, or just lookin' ugly?