The next step wasn't easy either: I had to find a way to attach the Kammy to the hatch with the following (mutually excluding, it would seem) boundry conditions:
- No drilling,
- Strong and stable,
- On/off in under 90 seconds with no/limited tools.
After about six 4km bike rides to the local sewing supply store I did the following set up:
The top of the Kammback has slits for a 4cm wide band which loops around both ends of an 5mm aluminum bar.
The bar sits against the hatch's hinges.
The band is not elastic, so I needed something to be able to adjust its length/tension.
The bottom corners of the Kammy have elastic line inside the canals which loop around a rubber stop on the inside of the hatch.
In the near future I will add an extra set of 4mm bands in the center for more stability (and to cover up the red plastic of the stop light). I will also add elastic line at the upper outside corners, but I'm not yet sure where that can be anchored. I'll also glue an extra piece of coroplast to the underside to make the whole thing more rigid.