By the way for all intents and purposes, the original build method of using the flex airline tubing to connect the magnet to the propeller still works just as well as the new "tube in magnet" build. Just be sure to remember to use the black airline tube that came with the original Maxijet instead of the clear airline tubing and you should be fine. With the original build, it is the clear flex airline that eventually stretched, gave way, and failed whereas if you're using the black tube this won't happen.
So instead of pulling out your hair trying to drill the magnet
I would suggest trying the original "simple" build first.
Just my 2 cents.