The roller on the switch lever is a beautiful and eleghant solution . . . but it requires relatively precise alignment. I silver-solder an actuator arm on the end of the plain switch lever and it can be anywhere within 1/2" vertical alignment and then I don't have to worry about making a switch platform to get in aligned with the servo wheel. The elastic pulls the switch back to preclude the rare (but occasional) spring failure in a micro-switch that prevents the arm from returning. We used similar switches in alarm locks where I worked and they had about a 3% annual failure rate.

Perfection is the enemy of good enough. - Russian Aircraft Plant Slogan.