No, I have Mag 21, Judy SL and Manitou bridges I've lopped the hanger off when fitting canti's; cut off with a fine-tooth hacksaw then filed, sanded and polished...
...job done
( Modded Manitou bridge on my Explosif in link below; quite a high res photo' so if you right click > view image > Ctrl + you can enlarge it and see the bridge quite clearly )