Oh, what you're describing is the method my wife uses for her BIAS weight weenie - very convenient indeed, I always think I should be doing that too!
It seems like I was confused about what a whoopie sling actually is, I don't own any and am not sure where to get them here...
But, I could probably just take ordinary strong cord and larkspur + make an adjustable loop at the hammock end, and at the other and use an adjustable loop either with the marlinspike hitch, or the above mentioned buckle I already have. It's pretty much the same thing.
Thanks for the explanation!
Amsteel is used winches on ships etc-----I'm sure they sell it some where in europe! Check marine supply stores etc
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