Assembling per the instructions, I found it difficult to get all the bolts in. Some didn't line up. I disassembled and tried again, leaving all the bolts loose until all were threaded in and they lined up better. Once tightened up, it's solid. From my experience it seems there's play in the various mounting positions which led to the problem. For what it's worth, the 90-degree-angled part is optional. You can assemble the straight sections as two tables.
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