Smoothing the speed range of servo motors

A list of links to folk who have modified servo motors.

Member ddahl on Leatherworker.net  https://leatherworker.net/forum/topic/40034-question-about-servo-motors/

Youtube video same topic. Video was first posted 2013. Things may have changed in the way motors are now manufactured.

I will crack-open my ebay purchased motor sometime and see if it is using the same technology.

update

Slowing down using pulleys.
https://www.youtube.com/watch?v=JbHj8pmL8EU