Long chains help lessen the coyote chance of pumping the stake out of the ground.
The best thing is to double stake with stakes driven in at opposing angles. There are double staking devices sold. I think that Berkshire makes them.
Another methoud is to take heavey snare cable and double ferrels. Make some thing like this O--O out of the cable. Slide the cable thingy thru the swivel at the end of your chain, then drive your stakes so they cross under ground. A yote can't pump them out of the ground.
More swivels are better than less. I don't think that the spring is that much of an advantage.
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