splicing your own rigging slings?

[Norm_Hall]

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...Two end is better for 'rope tools' (whoopie, loopie) because the outer braid cinches on the inner braid better.

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I had never heard this before--can you site some evidence for this?

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It's known in the trade that 2 carrier is better for rope tools:

http://www.sherrilltree.com/Professional-Gear/Block-and-Sling-Combinations

http://samsonrope.com/index.cfm?ind=13&app=27&rope=452&inst=1

http://www.yalecordage.com/arborist-rope/rope-tools/adjustable-slings.html