yea, you buy one of those tupperware bowels...........................bout medium sized and cut a piece out of the bowel that would look like a hole that cartoon mice disappear in in houses on the cartoons. just be sure and file it good so there are no rough edges . then you use it lid on bottom bowl on top..........................................does any of that make sense????
mine would not ever use it. I wrap all my cages in sheets to keep everything from being on my walls or floor. some people hang shower curtains on the wall.