I’m bringing this back again, and for the exact same upper arm, though the design has been significantly updated:
The issue that stumped me on this design for so long is the fact that the ball, as well as the thin 3L and 4L liftarms, could rotate about the medium blue Technic connector. To prevent this, the lime liftarm must connect to the socket piece. However, the connection must also be completely flush; I can’t just use a 2L axle as shown below:
My current solution that I devised months ago, and that was used in my Tuyet MOC that I shared here, is to use a 2L rigid 3mm tube, since it can pass through the “barrier” between the axle holes in the socket:
However, the flexibility of the part, as well as the small number available on BrickLink, make me hesitant to use this solution in a Canon Contest entry if there is a better way.
Today, I might have thought of that batter way: the relatively new minifigure wand piece:
And that brings me to the point of this post: would this wand solution actually work? I don’t have access to my parts right now to test it myself, nor do I even have any wands.
My greatest concern is that the “ball” of the wand might not form a stable enough connection with the axle hole of the lime liftarm, or that it might have a tiny amount of wiggle. Are these concerns legitimate, or does the solution work?