Dave Sr. from SWISCO responded:
November 27, 2017
I'm afraid they don't have a corner roller in this size with anything other than a nylon wheel. As for the strength of the spring, the roller uses a adjustment screw to keep the wheel adjusted. The spring just keeps some tension on the wheel, it's not meant to hold up the weight of the door. I don't think the spring would have any bearing on how long the roller itself lasts.
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