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I have rescued 740 wiper arms for years.
Always clean the splines mentioned in the other post then -
1st try - add a washer under the nut - this pushes the arm down further, and often the splines will work.
2nd try - add some soft metal to the splined shaft to take up space. I have wrapped small diameter, soft copper wire around the splined area and used the arm for a season or so.
3rd try - new wiper arm.
Check the nuts often, always park your wipers when you complete a trip, and always clean all ice and snow off before you run the wipers.
Good luck
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96 855R, 95 855,854, 90 744 Ti - 343,000 Volvo miles put on 7 bricks
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