It's hard to say how that pedal might've been modified or if it was just serviced.

I stopped modding wahs a while ago- they seemed to get worse the more I modded them and I realized it was my technique and expectations that were the problems.

I have 3 wahs- a Crybaby mini for when I want to travel light (it actually sounds good and functions well), an older Fulltone Clyde and a stock Vox 847 for when I want to shave a little high end off of a cranked British style amp.