Goosenecks RS 420 Cg, SRS 420 Cg
First, fasten the two AF 1s securely, one precisely above the other, to the lectern or table top. Then screw the gooseneck onto the 3/8'' threads at the end of the ST 20-3/8 cylinder. Push the XLR connector of the output cable through the AF 1s and press the cable into the groove in the side of the cylinder. Finally, insert the cylinder (with the output cable now attached) into the AF 1s.
With the RS 420 and SRS 420 goosenecks, two AF 1 flanged mounting adapters should be used for stability, one above the other, with both holding the microphone amplifier (e.g. CMC).