They are as follows:
-The one on the left is the design described in detail in my previous post
-The middle one is the same as the first, only with the top removed. This would reduce manufacturing cost and weight, though as the anchoring system of the shoulder to the beam is now essientially an open system, this woyuld significantly decrease the strength.
-The one on the right is a box design, essentially the same as the first design except in one solid block. This would increase the stability of the anchoring of the beam into the shoulder, though at the same time would significantly increase the cost of manufacture and the weight of the leg as a whole.
In conclusion I believe the original design is the most suitable, though in order to be certain this requires farther stress analysis to find the best design.
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