Today, in order to accommodate the possibility of more kittens, I have heightened my table in order to fit another cage underneath. To hold the heightening blocks in place I have made some double headed nails. I made them by cutting the head off of a normal nail then holding it in place with a drill, I then spun it at high speeds and held a file at an angle against the cut head of the nail which shaved a fine point to it. It worked rather well I think, it would be nice to have a second cat or kittens at the same time.