Major upgrade in progress,Please bare with me.:F
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it already existed, I have a vane made out of pizzabox cardboard hanging of my house 24/7 7 days a week .It takes a bit of working setting it up but its an easy way to measure vert.
it's the biggest trick in the run game.. go slow to go fast. it doesn't make sense until it smacks you in the face and you're like ....... wtf?