What battle problem is Metal Needle meant to solve?
Metal Needle is mainly used for spin preservation and stable late-battle movement. Final performance depends on the Blade, Ratchet, stadium and launch.

Stamina
Start with Shinobi Shadow 1-80 Metal Needle; it is labelled as a official stock pairing with the note “Takara Tomy UX-05”. There is no second verified build yet, so do not invent one just to fill a deck.
Metal Needle is mainly used for spin preservation and stable late-battle movement. Final performance depends on the Blade, Ratchet, stadium and launch.
Metal Needle does not appear in the 20 recent winning decks reviewed by BeyXBuild. That does not make it unusable; it means the site should not call it a tournament-proven staple yet.
Metal Needle is mainly used for spin preservation and stable late-battle movement. Final performance depends on the Blade, Ratchet, stadium and launch.
Compare Metal Needle directly with the Ball Bit in the same complete build. Run at least five launches per side and record knockouts, bursts, self-knockouts, scraping and spin finishes; change only this one part.
Drop it if the extra spin time disappears once contact starts, or if it repeatedly loses the equal-spin and opposite-spin matchups assigned to it.