The Screw,taping,4x20 is the most widely applied product in the CHF50 CREA SCOOPY/DX 2010 (A) JAPAN AF55-190 E-6 ( four times ).
The lowest price component in this E-6 parts-list fiche is the Screw,taping,4x20.
The E-6 assembly is constructed from several parts from which the Fan Comp,cooling is the most expensive.