Looking for a way to connect SG90 servo motor to Lego Technic hole in a brick, in order to control Lego train tack switch After looking at this question:
Can I remotly control the points on PF train tracks?
I got the idea of controlling the train track switch handle using a servo motor that will be able to move the yellow handle to both positions.

The included video in that answer:
http://www.youtube.com/watch?v=WoNiq5FCd9U
Shows the general idea of how to convert the circular motion of the servo motor into a kind of linear movement that will be suitable for the handle.

So it seems that with a set of Lego Technic bricks and engine - it should be easy to acheive.

My problem is that I want to use an Arduino controller for this, with a cheap and simple servo called SG90:
https://www.google.com/search?q=sg90+specifications

So, what I need now, and a way to connect the SG90 motor to a similar kind of cunstruction, to acheive similar outcome like in the video (and in the question).

Many thanks for that!
There are numerous solutions over internet for attaching SG90 servo with LEGO. However I remember this particular video, which fit your need to attach/control Technic beams/liftarms. It also features required parts for this build at 7:48.