any magnet coupling mod for Trackmaster?

Rather than buy these trains just to harvest the magnetic couplings how about these custom designed ones?

I've designed them so that you can glue 10mm diameter circular magnets to the disc part and this will then swivel left and right in the frame, thus enabling the coaches to take corners better without straining the magnetic connection too much.

So far I've made 3 variations on the design with 3 different Tomy connection types which should cover most engines and rolling stock (see pictures below);

Type 1




Type 2


Type 3

I printed a prototype of the 'type 01' connector, this came out ok apart from the pin on the top of the Tomy end, this is possibly my fault when I removed it from the bed and stripping off the support material.  It was also only printed in draft mode (0.2mm) resolution so final versions would be far more accurate.  Anyway so you can see it here's a small video of it, I'm also not sure about the height of the unit, I may have to try another design, but at least it did do one thing I wanted, print in a single piece and still have the swivel I was looking for

type 2 and type 3 seem to work the best.  My problem is where can I find a magnet that fit exactly in that slot?  If you provide a magnet glued to your 3D printed coupler, it would be a lot better.