On my RP80, I looked at it and there was nothing I could find that was anything like you described. I just tightened up the screw in the pedal, and it worked like a champ again (or as good as it ever was;) ).
Actually now I'm saving up for one of the big new Zoom units, the G9.2tt.
The G series Zoom pedals far surpass the RP models, IMO. I'd like to try the new RP's though, the 150, 250, and 350.