There are small pins in the pivot that have to be driven out. Once the pin is out the entire pivot comes right off. Under the pivot is a tiny spring, be careful, don't lose it like I did. The pivot is tensioned by a spring washer which is probably shot. I used a thin flat washer left over from an EGR valve I replaced. Put the thin washer, the spring washer and then the pivot on and GENTLY squeeze the pivot in with a c-clamp. Drive the little pin in and you're done. You need to be real careful doing all this cause the vent glass can easily break. It got rid of that annoying whistle in mine. Hope that helps.
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