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Based on the description from fit4kris on his new Tanabe bar, it looks as though the attaching nuts and bolts are not as poor as the ones from A Spec, and from other photos, it also appears that the eye bolts that attach the bar ends to the tower brackets are actually two pieces (one piece being a lock nut).
I have not seen a Tanabe bar in person yet, but from all other indications, it looks like the Tanabe bar IS worth the extra few dollars. Your description of the difference in strength between a tubular vs. solid design is correct from an engineering standpoint, but wall thickness would play a part in deciding how well made a tubular bar actually is.
Good luck in making your decision whether to wait for a stud-mounted bar or making your own. If you have the metal fab. ability and access to the right materials, you could pick up some decent side income from sales to other fitfreaks!
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