When I put my Splendide in, I drilled a 1/4 inch hole through the inside wall only, on the "drill here" mark. Didn't hit anything so then I used a 1 inch spade drill, again through the inside only. I stuck a finger in to feel all around to make sure there were no obstructions. Then I used a 1 inch hole saw with a 1/4 pilot bit to drill the 1/4 inch hole through the outside wall. I followed that with the full size hole saw to do the inside wall only.
Once I had the 1/4 inch through the outside wall, I used my full size hole saw with the 1/4 inch pilot to bore through from the OUTSIDE for the outside wall. Doing it this way insured my full size holes lined up for my dryer vent and I had no splintering of material on the outside, or inside.
If you only have a small hole in a stud, move over enough to clear it and continue on. You can put a screw in your false hole if you want to plug it with something.
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