My Vertical Compass had a 150 degree error when it was mounted on the top of the instrument panel. I made a Degaussing Coil to de-magnetize the struts. I pulled the Degaussing coil out of an old tube type TV and wired up a push button switch to activate the coil. Use the coil to go over the metal struts but be sure to remove your compass first and keep it away. Also activate the coil for only short periods due to the overheating of the coil. You can “Google” the procedure on how to make a Degaussing Coil, or borrow a “Growler Coil” from your A&P friends. The welding of the struts causes the struts to become magnetized, the coil worked great and my compass now reads correctly.

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