Ron this would be better posted in Chevelle Maintenance forum. Anyway, not sure what you have tried so far. The wiper arm fits down on a splined post. If you pull it off, there is a clip on the bottom side that holds it, you can rotate it to a new position and push it back on again.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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