Quote:
Originally Posted by doofus
I loosened the nut and pried the wiper arm off the shaft. I don’t know what it looked like when it was new, but it appeared that whatever splines it might have had were just about gone. Putting the arm back on and tightening the nut snugly did the trick, though. Won’t be switching the wipers on anymore unless I’m sure they’re not stuck to the glass and the snow is cleared off completely.
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The splined shaft is steel, and I believe it makes splines in the alloy wiper arm when you tighten the nut. I've seen these wear the hole in the arm excessively if they worked loose repeatedly, or were operated loose too long.
Then just tightening the nut may not prevent slippage anymore. Adding a washer under the nut usually fixes this.
With the arm off, it's also a good idea to clean the splines on the shaft with a sharp pick. But you'll probably be OK.
Happy Motoring, Mark