In Norse mythology, which magical product was recalled by its creator due to a critical design flaw that allowed it to be stolen by giants?

Throughout history, mythology and folklore have featured divine craftsmen and magical items that shaped civilizations. These ancient stories often parallel modern product development cycles - from concept to creation to market reception. Test your knowledge about how mythological artifacts were 'developed' and the product cycles of legendary items that influenced cultures worldwide.

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Thor's hammer Mjölnir, which was made with a handle too short because Loki disturbed the dwarf forging it
Odin's spear Gungnir, which would not return to its owner after being thrown
Freyr's ship Skíðblaðnir, which could not be folded small enough to fit in a pocket
The necklace Brísingamen, which caused its wearer to become visible to enemies