How to Adjust 23-038 top guide

A quick learner from Michigan, USA says:

I have a set of closet doors with 23-038 top-guides. I need to extend the guide. They are currently at their "lowest" setting (guide closest to door itself) and I need to extend them up.

I've been playing with this for a few hours and cannot see how to move it. I don't want to break it. I can see the central stud/rivet that holds the plastic glider in place, but cannot figure out how to "release" that stud/rivet/screw to allow me to slide the plastic glide "up".

Hoping it's simple and I'm just being dense ;-)

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Paul from SWISCO responded:
The manufacturer of the 23-038 did away with the adjusting screw and now design the nylon piece with notches for the rivet to lock into. To raise the nylon guide, install the 23-038 on the back of the door and place a slotted screw driver in the slight indent on the nylon guide, then tap it up.
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