Using inspiration from the cover clip used to hold parts to the aluminum extrusion, I created an Allen key holder for the keys given to you when you buy the XL. Super glue the two parts together in the orientation you prefer. I put mine in the top horizontal extrusion shown in the picture.
For a tighter fit to the extrusion, you may need to set the clip piece to 103-105%.
The author remixed this model.
Added an Allen key holder to the cover clip latch design