Allen

No glue. The rails are held in place with screws, and smooth plastic nuts. I laid the rails on the back, marked through the holes with a grease pencil, and drilled the holes with a rotary tool.

--A

{edit: Note to self, not only completely read other folks posts before you respond, read your own.

I mean it does not bounce around on the rack at all. So that would be epoxy.}