Magnetic drywall cutter.
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Previously:
https://www.homemadetools.net/forum/...278#post161500
https://www.homemadetools.net/forum/...206#post145873
https://www.homemadetools.net/forum/...562#post158950
https://www.homemadetools.net/forum/...728#post155816
https://www.homemadetools.net/forum/...190#post153824
