Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Does anyone know which set this piece belongs to:
The top two pieces there (not the 2x2 square) are
Cylinder Hemisphere 2 x 2 Ball Turret Socket Base
Cylinder Hemisphere 3 x 3 Ball Turret
The top appears in 28 sets, the simplest of which is this ion cannon
Required, but never shown