Once the the threads cut the nylon it does not grip as well on a second application. That being said you can tap the nylon end of the nut with a hammer. This will changes the nylon profile for a better grip in a pinch.
I know just what you mean. Especially after watching the crane swing I am always looking at new places to apply my climbing skills. Have not yet followed though on any yet. Stairwell is a good one!
Almost worth a trip to visit my sister in Riegelsville PA just to meet you at Washington's Crossing some Sunday morning.
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