To prevent Fire Arms from being Bewitched (Spell)

From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:

To prevent Fire Arms from being Bewitched.

Take nine blades of straw from under a sow while she is nursing young pigs, therefrom put nine knots into the shaft and insert them between the two barrel loops, and such a gun cannot be bewitched.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

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