I don't know how to delete posts and I want to delete this one.
Last edited by renderu; 03-09-2013 at 05:22 PM. Reason: don't like my description of the problem and it is solved
First, some pictures or diagrams would help a lot.
That said, in my opinion the design firm's response does sound plausible to me. It is possible. As I understand it, the thinner guide pieces would allow more angular deflection. Any off center forces cause the slide gate to try to "rotate" within its guides. This angular motion can be a source of the "stick/slip/binding phenomenon" you mentioned. The more freedom the slide gate to rotate, the more likely it is to bind. That's also why the ratio of height to width is important. I'm not saying that IS the problem; I'm saying that COULD BE the problem.
Look closely at the contact points where it is binding. You will likely see some scarring or other damage. If there is no appreciable side force, the only way that damage could occur would be if the slide gate is trying to rotate within its guides.
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