Help with a reel problem

I have an old abu garcia spinning reel (cardinal series) that I have owned for 20 years or so. I have plenty of other setups for crappie but this reel holds a special place in my heart. I can't even estimate how many crappie this puppy has reeled in over the years. It is well taken care of and in very good condition.

My issue: The drag is not working properly, I tighten the drag all the way up and can still pull line from the spool without much force. Is there a simple fix? A part that I need to replace? Or is this one ready for the great rod holder in the sky? Any help would be greatly appreciated.

http://www.surviveoutdoor.com/schematics/abugarcia.php
Go to this page and scroll down to the Cardinal listings. Your reel schematic should be there. Look and see if a drag washer is listed. I'll bet it is.

Thank you for the link!!