R U The one nut behind the dash

I have never changed my bushings, I
bet it's because you use your wipers
alot, and also use them to clear snow
off the windscreen.
This would be tough on them, might
see if you could have some brass ones
made, or make them yourself, they would
wear longer I think, as well as brass is
a self lubricating metal, preventing noise
Good Luck
Wild