The next modification was adding another orange rubber band shaft&nub for better securing the parachute and combat module. The combat module I had fit my Challenger, but it didn't fit tight/close on the A3. I had to remove some of the module stand-off as well as some of the rear undercarriage of the fuselage. I then filled the open area with epoxy. I also put some extra epozy around the boom where it enters the fuselage. I only use the combat module as a shrill locator if the A3 should ever get away from me and go down out of site.