The left side hinge is not guaranteed to bend a worth while amount more than the right hinge. I've had it seemingly make no difference on some white oak. Multiple kerfs would have been better to force a slight bend in each kerfed section along the larger hinge height.
It also depends on how tall the log is vs the diameter, and how much it weighs. Double diameter quadruples the cross sectional area, so volume and weight will quadruple, and increased height adds leverage, so that only works with small or short trees. The only way I see getting a big tree to do...
Might threaten with a lawyer, see if you can get a lawyer bud to send an official looking email for cheap. That usually gets results from unresponsive businesses. They know it's not worth loosing lots more $.
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