Notes：

should avoid turning the servo by hand without power ( as doing so will change the limiting position of the servo, which can lead to problem in the assembled structure )

Components overview

steps
assemble the pan & tilt structure
assemble the base part PCB 4 columns display fixture （with small bumps） 4 sided acrylic board
assemble the geared rotation platform and the tilt structure on the top cover align the entire top part with the four columns, and insert and secure firmly
Done！