Unorthodox methods?

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I reinforced this oak limb with a doubled up tow strap back to the trunk. Like the previous post, I think it just a matter of researching tensile strength vs force and doing a little math...right? I actually had to stand on the 340 and crank my come-along up into the tree BTW. wife made me get an engine hoist/crane...But the madness continues...

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