I need to capture a half-feral cat with a serious medical problem. I have a large wire cage that's not designed to be used as a trap. If I tie string/ rope to the open door, pass it through the wire cage and run it along the g round, it would be possible to wait and pull the string once the cat enters . This won't work unless the door closes and at the same time a knot ties i t shut. The knot needn't hold long, 10 seconds against a large strong cat s hould do the job. Question is, what knot should I use?
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