Oil Pressure Valve

["Erik & Kathryn Cardinell" <Tycard@msn.com>]

I have a question I hope someone can help me with.  I own an '80 MGB and the 
oil pressure flucuates all the time that I drive.  I thought that I would try 
the oil pressure relief valve, but when I removed the hex nut that covers it, 
I could only remove the spring (which was a 1/2 inch shorter than the 
replacement spring) but I could not remove the cup.  Does anyone have any 
ideas as to how to remove it?  

I would appreciate any and all help!

Erik Cardinell (Tycard@msn.com)