[mcguyver]

The age of the cylinder to me is not an issue as long as it is physically in decent shape. I have serviced some with multiple dents and perhaps 2-300,000 rounds on them, they just kept on going. Others have worked right up until catastrophic failure, like broken spring or nozzle. One came to me with a broken nozzle, broken spring, bent rack gear, broken piston severely dented and swelled shell. All I could salvage was the spring guide.

Older ones are out there, and in decent shape (occasionally even new) and are worth paying $150 in my opinion.

Have tried Tokyo Arms yet.