That looks like good progress, roebuck. Just one thing though: check that the magnet is still magnetised. Heating magnets can have a bad effect on them.
What I don't understand yet, is how the original magnet carrier attaches to your other flywheel. Can you explain that, with a picture or two?
It does look as if careful hacksaw work is a good safe way to remove the new magnet from the new carrier, but I'm not yet clear on whether the whole of the new carrier and magnet could be installed on the old flywheel. If it fits, it seems like you could remove the glue residue from it, put a new batch of glue on it, and screw it onto the old flywheel as a permanent job, much better than the original one. Of course that requires that the whole new magnet and carrier weighs exactly as much as the old magnet and carrier, to keep the engine in balance, but you'll have to check the balance anyway, and correct it if necessary. We can talk about that once this part is sorted out. Essentially, you would have to either drill a hole or two in the flywheel rim opposite the new magnet to reduce weight, or bolt and glue on a small piece of steel opposite the new magnet to increase weight. It is not a big deal to do.
