Is this common problem?

I've had this too.
I changed the Z-Bar bushings.
There are nylon bushings on the frame side and the engine side of the Z-Bar.

New bushings ("bearings") and other small parts already from Brewers.
New fork rod. Notice the picture does't show a "jam" nut on it.
I've got one on mine to prevent the "adjusting nut" from turning out of position.
Was that my idea or did it come with one?
Probably my idea.