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- Jun 5, 2016
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- Northwoods of Wisconsin

I agree, that smaller hole seems like a step backwards. When you enlarge the hole do you chamfer or angle it up any? Or do you just make it bigger?
Bigger and chamfer it both. I use a tear drop shaped diamond bit. Push it instead the angle the hole is to enlarge, than tip it towards the back to give it a little extra.
I've seen these bars with the hole full of paint and no oil at all.