I wanted the handle to be firmly secured rather than held by magnets, so this mod removes the magnet holes and switches the holes which previously just hooked onto the screws to holes you can put a screw through into the threaded hole of the case.
The angle of one of the holes would make a straight through hole appear on the outside, so I had to shift it back a bit. This means it's at an angle, which can make it a bit fiddly to insert the screw, but it does mean that the external look of the handle is preserved.
recommend replacing the default round head m3 bolts with the hex head type. m3x8 should work. Install the screws in the part first. Getting them through the hole can be slightly tricky. Once you've done that, simply align with the case and attach.
Thanks to Scott for his excellent design and providing the STEP file to make this remix.
The author remixed this model.
This uses screws to attach the handle to the threaded holes on the case.