Mine drove me crazy, even new wipers chattered with light rain. The blades wouldn't roll over when changing direction. I ended up tweaking the angle of the arm and it solved the problem. two adjustable wrenches and twist just a little. Don't need much.
"It`s not important that you know all the answers, it`s only important to know where to get all the answers" Arone Kleamyck
"...An unarmed man can only flee from evil, and evil is not overcome by fleeing from it." Col. Jeff Cooper
Sunset Creek 298 BH