FSU Innovation Hub

I think the handle is glued on, but I don't quite know how the numbers stay on the handle. The handle has to turn freely but I don't see how the numbers stay on the lens. My concern with gluing is making sure my understanding of the mechanism is correct. I would hate to apply glue incorrectly and lock up the part. I'm hoping if someone else had had this issue maybe they have special insight into the mechanism.

While adjusting the diopter, it the handle and the numbers fell off. Has anyone experienced this before or have any advice on how to put it back on securely? I reached out to Vive Support and it seems odd that this piece would cost at minimum 160 dollars to glue back on. Maybe I'm missing something?