adjusting wiper blades

Another water related question, sort of. While working on tracking down the water leak mentioned in my previous post, I (again) noticed that my wiper blades are uneven be a couple of inches. Is it possible to adjust them to make them more even or is this simply a matter of an aging car? If so, where can I find instructions to make the adjustment? thx. Also - any tips on which maintenance manual/user manual (besides the manuals for sale here, which I will certainly purchase as they seem to get rave reviews) is the best general manual to purchase for working on my new 85 300td??

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