The new drone must have an upgraded (silicon) bottle? They're all most identical, so a spare new drone bottle, maybe?
The LV 7 mil isn't cheap! I think it was $30 for 5, wouldn't of been too bad if that hole didn't bug me!
That hole would bug me to, I'd be tempted to use some JB Weld to close that off. I'd use a dremel and put a chamfer on the edges both on the inside and out, wouldn't have to be all the way around, just enough so the epoxy would form a lip on both sides and it wouldn't be able to fall in or out. A little tape on the inside to act as a dam until the epoxy set up, a little sanding and the hole would be gone.

