Yeah me too, as to the Mavic magnet. A good source of magnets are from the backing piece of the corporate name tags. No more pins to ruin clothes. I salvaged one off of my name tag (You can get a blank one for like $3 at a trophy store or Staples or some local office supply place).
Just superglue it to a spoke or glue it to your existing holder. Trust me those little magnets are very strong.
zac