What battle problem is Under Needle meant to solve?
Under 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 Clock Mirage 4-55 Under Needle; it is labelled as a recent top-cut build with the note “20% of this Blade’s recent podium builds”. Compare it with Clock Mirage 7-55 Under Needle while keeping the Blade, stadium, launch and opponent consistent.
Under Needle is mainly used for spin preservation and stable late-battle movement. Final performance depends on the Blade, Ratchet, stadium and launch.
Under 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.
Under Needle is mainly used for spin preservation and stable late-battle movement. Final performance depends on the Blade, Ratchet, stadium and launch.
Compare Under 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.