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Originally Posted by Bagger Lance
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This is the thingie (yeller arrow) that made me think you are using a swivel for #3 in your model.
What is it?
You still have some splain'in to do. 
If this isn't 1-L, then we need some labels on the artwork to define what each object represents.
Thanks,
Bagger
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Its all in 2-K and 1-L that define the planes and the mechanical structure which duplicates the left arm anatomically.
The yellow arrow is the pointing towards the swivel in 2-K which defines the accumulator no.3 of the left wrist....