Servo Gripper

I needed a gripper for the robot i'm building with my son, and found the Solid MeArm gripper to be quite nice and functional, with a low count of additional screws. It had the drawback of being too thick, and didn't have the right mount for my bot, so i remodeled some parts using OnShape to be more precise and also because i like to use parametric cads to adjust things quickly. I did not remodel the arms as they only needed a thickness change, i did that using blender. Also i changed the design for the servo spacer to made it thicker and attach it to the rear screws, since the small 2mm screws that i have for the servo are not long enough to reach the top plate.

Links:
[OnShape document with some parts](https://cad.onshape.com/documents/a93302d742bc92346343330c/w/660612e2411b311c14e19e90/e/fba47646f1671e6656b84c8c)