If those parts don’t move around during flight, do a compass calibration with them attached prior to takeoff, and that should calibrate and fix any compass issues. There are other metallic parts on your drop unit, including the servo motor and...
Hello from the Crossroads of America tas99.
Nice to meet you Tom. 🤝
I would use a plastic, brass, or aluminum hook that is light weight and non magnetic, which shouldn't mess with the compass.
I don't have an M3P for reference but thought...