On LOTR the left habitrail has a plastic shield to prevent the ball from flying out.
It looks like an after thought by Stern. I made this fix using 1/8 inch brass rod.
###Edit- I have started selling these for $20 shipped-- just PM me###I had to raise the price as I was loosing money. I try to break even, I just don't want to loose money.
-----Or You can also make-it yourself, see below----
Post edited by ryan1234: I have started to charge $20 instead of $15.