Hey man, wd40 is not that good for lubricating my friend. As ive already said you will have to "grease" it. White lithium grease will work for what you need. I got my mechanic stethascope and moved the seat around a bunch and listened for the squeek and got it but my problem is comming back. If grease doesnt work then I would track down the part thats making the noise and tightin what needs to be tightned.