When you get the fix-it flywheel and are installing the magnet, there's a "trick". You'll find the lip that the magnet sets over isn't a close fit, there's some "slop" between the ring and the flywheel. When I glue them on, I use some cardboard spacers to center the ring for the glue job, then remove them when the glue sets.
You apply the glue to the flat surface under the magnet ring, and make SURE the dimples on the ring are on the glue side, the plain side of the magnet ring faces the sensor.
I'm currently using Loctite 380 Black Max for the job, it's never failed me.
I've also used E6000 adhesive, that works fine as well.
