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Now, I do have a HG Arios. Its actually always on my desk.
I checked both left and right joints when I built it and just now, and they are very much solid. In fact, I can even say they are perfect.
The points of articulation for this arm is the ball-socket shoulder joint, the "PC-in-part" joint (I guess you can call it that) and the shoulder joint.
Several things might have gone wrong.
Firstly, shoulder joint problem. A) ball is too small/socket is too large. Very common problem. OR B) the socket isn't placed correctly. The socket can go inside the torso and face outwards instead of upwards.
Secondly, "PC-in-part" problem. Couple of problems here. A) PC pieces is too small. OR B) should armor has too big a hole. How to solve this. Take a PC1 part, drop a small amount of superglue on each side. Let it dry. Reassemble shoulder part. Test.
Either way, just lift the arm up to a straight position and drop it steadily. See what part it isn't holding.
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