Hello, I figured I would just revive this older thread because it has all the info already as well as pics.

I have the same end on my wiper motor as the 2 pictured in this thread. The second picture looks exactly like my wiper motor.
As Gocart897 stated:
"it just seems odd to me how the end of the shaft on the truck is tapered and doesnt seem to have any broken parts off of it."

Mine appears the same-not broken. If it is not broken, how would a wiper arm attach and turn the wiper arm? Friction?
The end looks like brass. I can see that there is knurling holding this small piece on the shaft, it could be removed easily.
Would this be the correct wiper arm. Part #WW122... http://www.oldchevytrucks.biz/34_46/full.asp?page=138
Anyone have firsthand experience with this wiper?

Wiper is out of my 46 half ton.

Thanks, Aaron.