97 rear wiper clunks

[98 mounty]

One of those little things that I tend to ignore but it still bothers me. My rear wiper arm on my 91 mountaineer clunks and clacks when ever I used it. It makes its clunks at both ends of the pass, and a even louder clunk when it returns to the holder after it is turned off.

Is this normal? If not can it be fixed?

 

[TPLYNCH]

Clunking back into the holder is normal. Never heard mine clunk while moving, tho the wiper does screech if there isn't enough water on the glass.