I've just taken delivery of this hedge trimmer:
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In this video (at this time point) Chinese Hydraulic Hedge Trimmer Junk or Not - YouTube the guy points out a particularly poor aspect of a similar hedger's design.
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Specifically, there's no kind of bearing for the drive fork pivot, meaning the hole, bolt or both are likely to get flogged out pretty quickly:
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Given there isn't a heap of material to work with, my first thought is maybe a bronze sleeve pressed into an enlarged hole the driven part with a grease nipple added to the side, and then some kind of sleeve for the bolt? Any suggestions welcomed.
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