Initially, the pieces fit very tight and the phone plug stood too high above the connector adapter. I had to saw the connector adapter to get the pieces back apart.
I modified your OpenSCAD model of the connector adaptor to relax the fit a bit and to allow for the strain relief on my cord which was preventing the plug from going down as far as I wanted. I'm not much into that sanding and filing that others talk about!
I think it turned out nice.