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... There is a potential for making proper collar cuts and not leaving pig's ears.
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I think it would be ideal for a greenhorn tree guy learning where to make the collar cuts (as long as there is an experience worker training him). But, ultimately the person behind the saw would be guiding the lazer guide. Therefore, there would still be room for error.
But, certainly, it would be worth a try for trainees & H.O. who would like to do their own pruning.
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And you still need to keep the bar at the appropriate angle. Other than that, I agree with it being a great trainer, Jamin.