Các chi tiết (components) tên lửa nước: mũi và giá đỡ altimeter

For a engineering project: 1 stage water rocket. The bottle used had a bit less than 45mm radius.
There is a sharp cone, a round cone, and a altimeter support (with a ring). The altimeter hole dimensions : 14,5 mm x 18 mm x 49 mm.
The components can be superglued to the bottle.

Edit : the altimeter support has a ring too big and the mass between the two boxes aren't the same. Check the new upload for a better altimeter. (note that altimeter is the smallest possible to enter a 45mm radius bottle)