Posted by Rick F. on February 25, 2002 at 17:25:25:
In Reply to: loosening lower 3rd valve cap? posted by Bill on February 25, 2002 at 14:39:36:
I bought a "Strongboy" wrench which is meant to open lids to jars.  There's a link below to see this device.  It's like a strap wrench with a steel band but has a rubber wedge near the handle.  Requires very little room to get the cap loose.
If I remember right, it cost between $12 and $15 from "Tabletools.com".  
If the link doesn't work, got to Tabletools.com and search for "Strongboy".  Hope this helps.
Rick F.