Slide the butcher block onto sawhorses for easier access. Fasten the butcher-block pieces together by drilling miter buckle (Image 1) holes in the bottom of each butcher block.
Place the biscuit (Image 2) into the center of the counter to keep the sections level.
Set the countertop in place. Insert the miter buckles into the pre-drilled holes.
Tighten the miter buckles underneath the counter. Do not screw the corner supports to the butcher block until after the sink is installed.