Bar modding

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Just wonder if anyone opens up the oil passage ways to get better oil flow or some thing of that idea.etc..
I have done that carefully with a drill bit. I noticed better oiling with Echo 620 stock 28” bar. A Dremel might be better as it’s easy to break drill bits. I would maybe just try to go wider up top but not any lower. I don’t have any studies or long term experience. You can always do more, hard to put material back;)

Gabriel
 

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