While you're there fixing things, swap out that big nut for one with a Nylon center.
The nut has been known to back off.
Best case is the wiper quits moving and you get the timing right on the splines, tighten that nut and proceed.
Worst case it it loosens, strips the splines and won't work again until you replace the mechanism with parts you have to order.
https://www.thorforums.com/forums/f8...tes-19510.html
Details are in the link above.
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