Now what in the heck am I going to use as a window? I found a package box from a programmable thermostat I bought many moons ago… yes, that will do. I knew I would use it sometime, you can use just about anything that is clear. Thin Plexiglas, the plastic CD that comes on top when you buy a Spindle (you could use that as a template for a window) and even a CD case, its up to you.
I cut the plastic a little bigger that the window and used clear silicone for the glue. You could uses Hot Glue or Plumbers Goop, but I would not use any kind of tape. If the tape were to come loose while using a CD I would hate to see what happens.
The plastic in place and glued down. It now needs to dry, so go do something else for a while.