How to remove and install dual top roller

A quick learner from Seattle says:
I have 2 mirror closet doors with the 23-055 dual wheel top hangers. I'm trying to remove them and install the new ones but I'm having difficulty just removing them. I can't even find a guide online. I'm also afraid of breaking the mirror.
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Tom from SWISCO responded:

These can be a little tricky to remove. The thing is that they're not screwed in or anything, instead those little tabs you see on the side are plugged into the frame of the door and held in just by the shape of it. In order to remove it, you need to take the door down and place it on a stable surface. Then, you want to take a pair of needle nose pliers and just sorta work the roller out of the frame. There's no trick to it, it's just a lot of moving it side to side until it starts to loosen up and pull out.

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