undermounted sinks to do it properly u have to fill in the top part of the cabinet with chipboard or something along those lines with screws all round or just put extra supports in .
then mark the top out and cut a hole so the sink sits flush with with the top of the cabinet .
after that u need to router a groove so the sink lip drops down other wise th granite will bend and u will see a gap .
or just cheat like most fitters do , after the granite is fitted using clear silicone stick the sink in and wedge it up with 2x2 or something to that effect .
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