It's your life.
Freely advertising this method is also reckless as some newbie my actually think what you're doing is fine.
Here is some knowledgeable information....Not that OSHA or ASTM know anything....
Pole gaffs and tree gaffs have different design criteria. The specifications for personal climbing equipment, which include climbing gaffs, are found in ASTM standard F 887-97, Standard Specifications for Personal Climbing Equipment. Section 8 of the standard, Climber Gaffs, provides not only for differences in the minimum length of pole and tree gaffs, but also subjects pole gaffs to additional requirements related to the angle of the gaff as well as the relative positions of the point of the gaff and the stirrup. It is possible that a manufacturer may specifically design a gaff for thin bark trees; however it still must meet the design criteria for tree gaffs, not pole gaffs. Pole gaffs have not been specifically designed for trees, thin-bark or otherwise; they have been designed for poles.
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