I've always been taught you keep that bottom side flat, no rounded edges and it's worked pretty good for me for 35 years of pole and tree climbing. I could count on a couple of fingers the times I've cut out and not cut right back in, both on poles, one rock hard pressure treated one and one...
You'll be fine with pole gaffs on thin bark trees Robert. I don't know where you are but about the only thing around here you really need tree gaffs for are old growth or dead pines or any dead tree where the bark is slipping.
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