Quote:
Originally Posted by Grumpy old man
...be very careful to "open" the shaft nut stay and use your favorite flavor of rust buster before trying to tighten the nut as the shafts can break. 
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Fact.
Use a pair of channel locks to hold the shaft still while attempting to loosen or tighten the nut. Ask me how I know. Mine twisted right off the vent window frame so I had to fabricate and delicately weld a new one on.