I screwed the Karlie wheel to the roof of the cage as found I didn't have anything the right height to stand it on. Removed one of the small back shelves to fit it in. The original idea was to have the wheel on a stand in front of the shelves but when I put the roof tubes in there wasn't going to be space for that. Anyway it fits well between the shelves at the back. Pickle had a look round the cage while I was taking pictures of the wheel
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