Threaded 12 Gauge Shell

I loved DeSteiner's 1887 shotgun. Printed two sets of them, however looking at the remixes for the shell they either need gluing, or filament swapping which is fine until you drop the shell and it breaks. The glue didnt work for me especially when using silk filaments for the bronze part as the continuous loading/unloading of the shell destroys the bottom lip of the primer. Then you're just wasting the top part. My solution? THREAD IT. I remodeled the shell itself, and added threads to t