The knot I used successfully on amsteel with a single ring or biner was the munter mule
http://www.animatedknots.com/munterm...matedknots.com
The munter knot is for belaying climbers, so its adjustable in both directions. The munter mule is the tied off version. Its easy to untie and readjust, and holds on the amsteel. Its not quite as convenient as the Garda. (It is not a version of the trucker hitch).
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