Must buy! This makes centering your drill 100 times easier. To be honest I don't know how you would have done it without that centering cone. For the amount of money you spend to center the router bit, you save 10x more than aggregation. As for me, I don't use a router as often as some people, and I'm by no means an expert at using it. However, it's one of those little useful things that gives you a little more time to set up the devices and figure out exactly what you're doing.
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