Here's a link to a guide to rebuilding a Blue Streak. It came in handy when I rebuilt my '65 rocker.
http://www.network54.com/Forum/275684/message/1177168737/sheridan+C9+rebuild
One thing you might check would be the spring in the pump lever. It's there to help hold the lever closed.
Anything that is complex is not useful and anything that is useful is simple
- Mikhail Kalashnikov
