Thanks for the review @peterjamesnugent, I've addressed all comments, also expanded the test script - would be great if you could have another look and address two things:

• correctness of the current solution
• whether Bar.Flip() is equal to mirroring against the plane with origin at bar center and normal parallel to bar tangent

...once this is done, I will update Flip method (if 2nd question receives positive answer), then create/update the tests and (hopefully) we will be ready to proceed with merging. Thanks!

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