can still be done. Take a scrap of cabinet material, and place it over the port opening. Trace the outline of the port cutout on the scrap. Now cut around the line ON THE OUTSIDE, but close to the line. Sand to fit the opening snugly, but able to be pushed into place fairly easily. Glue the piece back into the hole. If you want, smear glue and apply another patch on the inside. Samps, I dig using my 3 inch hole saw...VERY clean outward edges of the port holes. I think the same "mandrel"(sp?) takes up to 4 inch or larger saws...quite a wrist wrencher when it bites a bit too hard into the work:(