Sliding Door Track Wheels

A friend from New Hamburg says:
Adjustable, two wheels, big center adjuster screw

About ten years old.
User submitted photos of a patio door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Your wheels look like they are made of nylon. That means our 81-172 could be a match. If you want to switch over to steel wheels, look at our 81-018 instead. Just make sure to check the dimensions in both cases with your sample roller.
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