I am installing Dual Grand Rapids Technologies multifunction displays, dual AHRS/magnetometers with internal WAAS GPS system coupled to a TruTrac Digiflight IV SVGS autopilot and Garmin SL-30. I neede to install one of the magnetometers in th eleft wing tip and the other one will go into the right wing tip. I built this supporting base and aligned the unit with the chord line of the wing.