I use 1" x 1" cable ducts in my control panel and although they make the wiring much better looking and easier to run I have a heck of a time to remove their covers after I install them.
When I first installed the ducts, I put the covers on just to see how it looks / works and when I tried to remove the covers I had to use pliers to pull them off (I'm glad I had no wires inside)
For now the covers are off in case I want to add / revise the wiring but I wonder is there a trick or method to easily snap off the covers?