Usual speed square with an 8mm bit, probably not? But if you have a small square, you just use the use it as a guide for the bit. It’ll keep you check on one axis, use your eyes on the other.
I mean, that disc looks fairly small, and there’s a lip that’ll actually sit flush around the surface when it’s installed, and it’s knurled. Taking it to a machine shop seems unnecessary?
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No, no…I’m not sloppy, or lazy. This is a sign of the boredom.
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