Surface mounts for screw switch PCB's -  you'll never have trouble arming a screw switch at the pad again. 

Contoured to fit any tube perfectly, and holds the screw switch right at the air frame's surface. 

Drill ac .3125" hole in airframe where you want the access hole. 
Screw the switch to the mounting plate
Scuff the airframe ID and mounting plate with 220 grit sandpaper and clean with alcohol
Apply superglue to the mounting plate
Align and attach the surface mount adapter to ID of tube. 

Reference Drawing