Moral of the story: Make sure your nuts are tight during aggressive slipstreaming changes. :icon_mrgreen:
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I didn't like how tight the nuts had to be to hold the wings in place (while open). So I eventually broke down and installed the "stops". So, I have basically two positions, open and closed.
The good side to this is that they are easy enough to adjust and the nuts don't loosen. The bad side is those nasty sharp "stops" have probably left their mark..