Crane tower

My english is not good, so I don't know what is name of part (I use number for that).
If anyone interest it and need file designed, please contact me (tungnt.ap@gmail.com).
Material:
- 03 servo 9g (hacked - goo.gl/Jr8fXy )
- 01 arduino nano
- 02 ball bearing (625Z - goo.gl/FDf1hj )
- 01 DC step down ( goo.gl/dUPLfY )
- 01 Joystick module ( goo.gl/P6FQLZ )
- 02 button ( goo.gl/sqTcBX )
- Motor driver
Option 1: 01 TB6612FNG ( goo.gl/XU54Nv ); 01 mini driver ( goo.gl/rKh3Sb )
Option