USB Port Cover for Nitecore MH Series Flashlights

Replacement cover for my MH23 light. Fits like the original cover.

Order was turned around and delivered promptly. Only issue is that there aren't any instructions on how best to install the cover. there is a "tail" for lack of a better word that is supposed to go in a mounting hole to secure it when the port is opened, but I ended up damaging it when trying to install the first of the 2 spare covers I ordered.

I ended up cutting it off completely and just using the cover without the attaching tail/tether.

It would be helpful to include directions/suggestions on how to properly install this small, yet important piece

The part I got is rubber and less than 1/2 an inch long.
It came in a zip lock baggie, inside a cardboard box, inside a padded envelope. This is super wasteful.

Thanks