This is the ring used to accurately locate the coils for proper flywheel magnets clearance.  Simple to use, just place the ring on the machined posts on the armature plate and slide the coils out to it, then tighten the screws.  Works on all OMC "Universal Magnetos" and "Lo-Tension" Magnetos.  Also used on certain Mag CD ignitions that have separate coils and sensors.  Not used on systems where everything is all one piece.

Coil Locating Ring