[#2040] Fix CM of launch lug & rail button instances #2053
Merged
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This PR fixes #2040. The CM (mass+CG) of a rail button and launch lug now accounts for multiple instances.
While working on this issue, I also noticed that the CG of the launch lug was incorrectly calculated. Here is a design with a body tube's diameter and length set to 0:

You can see that CG.y is not in the center of the launch lug. The same issue was present for CG.z.
Behavior from this PR:
