Hand Controller for Micro Focuser (Customizable)

Thanks to "gzip" for publishing the electrical scheme on "Instructables". In my case, I have used 2.2 Kohm resistors and TIP41 NPN power transistors, as indicated here: http://www.electronicsteacher.com/robotics/robotics-tutorial/advanced-robotics/controlling-dc-motors.php
Here the link to "Instructables": https://www.instructables.com/id/H-Bridge-on-a-Breadboard/
As you can see on images, I've decided to reduce the 8-pin connector from the Focuser to a coaxial connector, to reduce the thickne