Arm Servo Gear
I'd like to share with you a small modification that it helped me a lot. I 've had some issues while assembling the arm servo gear. The servo horn screw has to lock and attach the arm servo gear, the servo horn and the servo next to side-panel. In my opinion, there is an un-nessesary space between the horn and the arm servo gear so that it doesnt allow us to screw properly the servo because of the lenght. So I have changed the small gap as you can see here https://www.dropbox.com/s/d6k29tkav4jrdqo/arm-servo-gear-modification.jpg?dl=0.
Hope it will help you as well.
ps. I 'm not really good in editting STL files, but if you want to use mine, no problem. Also, I printed it at a scale of 95%. https://www.dropbox.com/s/m9bxk57xi86ohte/arm-servo-gear-hole-edited.stl?dl=0