Is it me, or does the retract line look a little short for that?
Anyway, I would have suggested a shorter fishingline which runs from the aluminum thing by the rats front feet to about the same height on door. The ultra simple way would be put a padded bumper on the metal track the rat is fastened to, then just rubberband or bungie cord to close door. Or for more difficult, you can just do a straight linkage out of like coathanger or something, but that you'd have to be more accurate with lengths and bends.
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