Sonar Fuselage Screw Pack BSonar Fuselage Screw Pack B attaches your Sonar A600 or A700 Fuselage to your Sonar AF or CF Mast. ATTENTION: Sonar Fuselage Screw Pack B (M8x35 TH CS T40) is designed to fit Sonar Fuselage and Carbon Fuselage with straight holes. Some earlier models of the Sonar Carbon Fuselage do not have countersunk holes, so will require this Screw Pack B (M8x35 TH CS). Newer models of the Sonar Carbon Fuselage will have tapered countersink holes. These allow the