Sometimes we're faced with enlarging an existing hole. There are a couple of recognized ways to provide an "anchor" to center the pilot bit on a hole saw. The most common way is to secure a piece of scrap wood over the hole (behind or in front) and then drill the new hole. A second way is to cut a plug, place it in the hole and secure it with spray foam, etc.
Well, I had to enlarge a hole on Touche' and I thought neither of the above methods would work. I dreamed up another method which I've never seen in my web research. Here's a link to my write up. Perhaps someone will find it useful someday. https://drive.google.com/open?id=1I84iwQstTrzPcvQf2lNEWi8xeGDPcHaH Dennis C. Touche' 35-1 #83 Mandeville, LA
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