Hello,
Saw the project half an hour ago, so I've recreated a similar rig just now to prove that I'm up to the task.
See the previews in the links below:
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(Made it as a demonstration, much simpler, yet it works as intended, all the arms move when the arrow object moves)
Can have this done tomorrow since it's late night right now.
Looking forward to your reply,
Best Regards,
Flavius