Inspired by the fantastic concept from OnyxHat.  Decided to build my own version from scratch, this version is not derived nor remixed from their source files.

You can upgrade how any kind of elastic or nylon strap buckles with this model!

You are able to customize the strap width, strap thickness, magnet radius, magnet thickness, and padding around the strap holes using OnShape.  I've included a screen shot on where to modify the values.  I have also included a step file with a 10mm strap thickness, 6x2mm magnet hole.

Made with OnShape. Edit it here.