SG-90 Micro Servo Horn with Gears

Servo horn for micro servos such as SG-90, MG90, MG92. The SG-90 has a 21-tooth gear on the head. I am adjusting the gear teeth on the servo horn side so that it works well. Optimized with my 3D printer (Ender 3 V2 and Artillery Genius). If the gear slips, I think it works well with proper scaling.