Blocking arm

We've come up with a better idea for the front blocking arm that will hold the flipper. It was initially going to be a simple arm extending down at an angle from the robot, but we realized it probably will make the machine too large. We were then considering coupling the arm to the front axle so that it flips down into the slot at the beginning but we've decided on something better. We will still couple the arm to the front axle, but instead of flipping and rotating downwards, the arm will slide through an angled slot in the bottom of the chassis and into the flipper.