I changed the design of pod (KW-30).
The mechanism is same as KW-30.
The previously announced "pod Yin and Yang" (KW-30-5, 6, 7) had a spherical central decorative part, but this is flat.
It seems counter to your intuition, this flat decoration part took much more time and effort than the previous works.
It could not be made with the same processing method.
Future issues are improvement of processing method and jigs.