Tom from SWISCO responded:
August 31, 2016
I'm not sure what it is you're referring to. Do you have a particular SWISCO product in mind? If so, can you give me the product code? From there I'd be happy to answer any questions you have. In general, we stand behind the products we sell and believe they will work exactly as intended. I can go into more detail on the precise function of the part you're looking at once I have a reference.
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Tom from SWISCO responded:
September 1, 2016
Thanks for clarifying! I don't recall any specific issues with these clamps. One thing to consider is the corner to which these rollers attach. It's possible the little tabs are worn down a little. I would check that in your door to see whether or not that could be the culprit.
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