Magnetic nail aligner.
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Previously:
https://www.homemadetools.net/forum/...013#post157043
https://www.homemadetools.net/forum/...653#post147654
https://www.homemadetools.net/forum/...484#post147063
https://www.homemadetools.net/forum/...100#post153560
https://www.homemadetools.net/forum/...376#post107211