Servo Holders for cardboard creations

Use these holders to easily place servos onto robotic dioramas or other displays made of cardboard. The rivet parts come from user hooligan404's cardboard rivets, which we use a ton in our K-8 makerspace! Servos can either be held horizontally such that an extender like a popsicle stick could stick into your diorama and move a character from side to side, or held vertically such that you could pull a string on a pulley or move a character up and down. The holders can be placed on the sides, back, top, or bottom of a box and hold the servo steadily in place! See the short video for examples by 2nd graders. The larger holders are sized to hold servos like the Hitec HS-311 (https://www.amazon.com/Hitec-31311S-HS-311-Standard-Universal/dp/B0006O3WVE) and the smaller ones sized to hold 9g micro servos like the Tower Pro SG90 (https://www.amazon.com/J-Deal-Micro-Helicopter-Airplane-Controls/dp/B015H5AVZG/). We've used with our Hummingbird robotics kits (https://www.birdbraintechnol