The needle as surgicaly removed from the near death Delorto carb on the poor little Derbi Dirtboy 10 . A new one fitted from a spare MiniMoto and droped 2 notches had the bike reving like a goodun once again . Not sure whats caused the damage , unless the previous owner uses a house brick as a precission screwdriver ? I had a mate ( CHAN YOU KNOW WHO YOU ARE ) Who attended and passed out from Scarborough or Bridlington Motorcycle colledge 15 years ago , yet still split crank cases with a hatchet and 5lb hammer .... He single handed kept Holts chemical metal in business throughout the 1990 recession...... But as far as the needle goes - May it rest in piece and no longer feel the rush of supersonic air as it mundanely metered the fuel air mixture, that gave it's first owner hours of fun .........