Large holesaw stabilizing trick.
<video controls autoplay loop style="max-width: 100%;">
<source src="https://diqn32j8nouaz.cloudfront.net/tooltalk_17408864269742.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
25-inch holesaw - photo
Drywall holesaw - photo
Holesaw plug removal techniques - GIF
