I might spend the exta and go for a cord grommet...however the 'smallest' i could find was a 1'' hole for the cord and if I was just using the one flexwatt cord, it would still have room, possibly enough for a cornsnake to fit thru. Maybe roll it in gauze, tape it up, then stuff it up.

Hmm...thanks Matthew for the PDF I didn't mean to sound impatient or anything. It is well done.

EDIT:

I only skimmed thru the PDF, how big is the substrate guard? I see it on the back I figure 2 - 2 1/2 inches big. Can you put on in the front so substraite doesn't fall thru the opening in the plexiglass? Maybe it's there maybe I am not seeing it.