My Woma is finally big enough to put into his Vision 332. When posting some time ago about best methods to heat the cage, Joan nicely responded and mentioned that the upper lip in visions are a problem, being that the snakes like to crawl up along the upper lid, and tend to fall down rather hard.
Anyway, I'm sure that many of you have come up with nice solutions to the problem, but wanted to mention mine which I think worked very nicely.
I bought 1 1/4" PVC pipe from Home depot for $1.49 (10 feet for a $1.49 mind you). Cut it to approximately 35 5/8" and it just beautifully snapped up into the upper lid all the way across the cage. Non toxic, non pourous (won't absorb odors etc.) Now my upper lip is a problem no more. 
Curt
