Hi there Stan,
I found this diagram for you: http://www.reuels.com/reuels/page494.html
If it was me (I have been taking things apart since I can remember just to see how they worked), that's what I'd do. Take it apart, give it a good clean (pipe cleaners and the like) with appropriate thinners, possibly get new "O" rings for a good seal and see how you go. I know, it becomes a sentimental thing...
All the best and regards
Gb