If you follow the directions you can find the joists but you can also pull subfloor and wood if it moves between joists. Recommend trying to use in grain to reduce look. They aren't that expensive and if you have finished ceilings I know of nothing else that can work as well. Hole left is not that noticeable and wood putty conceals well. Sort of like when you face nail the first two or three rows. Of course if you are looking for them you will see them.
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