I built this table recently and when you bump it, it vibrates continuously for several seconds. Imagine a tuning fork vibration, not a wobble. It makes everything on top of the table shake.
Does anyone have any ideas on what is causing this and what could be done to solve the problem? I just welded brackets in the corners and it did not fix the issue. I will try to post a photo of that as well. The steel tube legs are open on top and bottom. I tried with rubber feet and without. Tried on hard surface and carpet.