Sliding glass door rollers

A quick learner from Ohio says:
The door is made by Great Lakes Windows. It is about 20-25 years old. These rollers are like roller bearings rather than traditional wheels
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Bob from SWISCO responded:

Many thanks for writing in. I am afraid this old 'tank tread' roller is no longer made. However, we've had people successfully use our 81-279 as a replacement. The adjustment screw sits a little higher than on your old roller but the wheel rides better than the noisy treads. Take a look and let us know what you think.

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