One trick that works if there is some purchase on the tree is to wrap the threaded loop back around the tree and then pull back on the strap to tighten. (Confused? The load is born on the eye loop, so you are cinching.)
Granted the hugger or attached may now be coming off from the side of the tree, which offends some sensibilities and centering of the ridgeline over the middle line of the hammock.
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