The lowest price component in this Carburetor (ts100n) (ts100c F.no.119365~tstcon) parts-list fiche is the Screw.
A sample from the products for the Carburetor (ts100n) (ts100c F.no.119365~tstcon) include: Needle Jet, Float, O-ring, Clip.
With four applications this Screw is the most specified part.