Prop Balancer for Hard Disk Neodym

Ok - there is already a whole bunch of balancers - but I found none that fitted my needs.
I had those magnets, that I retrieved from two old hard disks. So I made this balancer. The slot for the magnets is 13 mm wide, 30 mm deep an 2 mm thick.

I purchased the balancer itself at Hobby Kings - it´s 45 mm long.

Prints standing up withhout support.
I added the FreeCad-files.

This is a - as I think - great explanation-video on how to use it:
https://youtu.be/-vakWrc86xE
by https://www.t