If your magnets come loose, but do not break up or otherwise destroy anything, go to your local hardware and buy some Gorilla Glue brand epoxy. and glue them back in. They must be spaced properly same distance between all the way around. When you pull the cover off and get a look at them the polarity alignment is correct. Mark the outside edge of all of them with a paint marker or magic marker. Pull the magnets out and use a wire brush wheel to clean off the old glue. Clean rotor body and scuff up with emery cloth. Make sure that all is clean and free of dirt and oil. Make yourself a spacer stick to get the magnets spaced right. Have enough of those little spring loaded clamps to clamp each magnet in place. Wait overnight, remove clamps and install. Actually the gorilla epoxy sets up within an hour or two and it takes a little propane or map gas torch to get it to let go if you make a mistake. Or you can buy an updated flywheel on fleabay for about $200.