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Woah- Hold on,
I had a similar incident a few years ago and incorrectly came to the same conclusion. Fortunately I did not make any "modifications" to the wiper motor spindle.
Try this- reposition the wiper arm assemply and bolt down snuggly using some loctite. That's all I had to do and all was fine.
The wiper motor spindle does not have sharp serations(sp?) as you might expect - leading you perhaps to believe its stripped. I thought so too- but at least in my case not an issue.
Though it's certainly possible that your spindle is stripped - let's hope not.
Worse case, perhaps a new wiper arm.
Incidently - I just replaced my drivers side wiper arm. Got an excellent price and service thru Dan at VolvoParts.com ( about $20 less than the local volvo dealer).
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