Are you sure it's one inch wide? That is one hell of a lip on the sink that
Ssuggestion #1: Get a rabbetting bit 2.5" wide with a bearing on the
bottom. Put a 1/2" diameter bearing on the bit. That will take you down to
1 inch radius. Then use the existing sink hole as a template to rout 1"
wide around perimeter. I don't know if you can buy a 2.5" rabbetting bit,
but the math works!
Suggestion #2: Make a template of the final size plus the diameter of a top
I presume its wood or laminate counter top, granite would be a challenge. I
haven't seen a flush mount, just over or under mounts. 1/16" off here and
1/16" off there will look like hell for flush mount, plus the inherited
water infiltration problem.
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