I’m finishing a MOC on stud.IO and have found that it doesn’t recognize a couple connections as legal. This happens on occasion with connections I know are legal, but I’m not sure about these two. They are shown here:
The first one is my preferred, the second a backup. I tested them both out. The first clicks solidly into place, but I’m not sure if the peg fully expands. 16 clicks = 1 rotation.
The second I would be very confident in, but the materials may be problematic according to Lego’s official “Stressing the Elements” PDF.
What do you think? It’s just a MOC so I could go ahead and ignore the rules, but I try to follow the conventions of official sets.