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Making progress! So, I accidentally found that the connection between the chip, top pin #6 from the left was not soldered properly. I re-heated that joint and flowed in a bit more solder properly, and
OK, I figured out a way to temporarily attach a little weight to the arm, and I'm right, it does make it work. I put a 1" #6 machine screw and T-nut on it, like this: