I have a door that weighs 500 lbs. It raises up on an arc. It uses an electric actuator to pull on the lever to raise the door and push to lower. I am modifying the door and do not know how to calculate the force in pounds to make sure I have the right actuator. I currently use a 1500 lb actuator. I need assistance with the equation/formula to come up with an answer. Forgive the typo.