The assembled Force Machine should look like the picture above. If the lever arm is angled more sharply upward (or downward), adjust it to a near-horizontal position by raising (or lowering) the rivet to which the rubber band is connected.
City Technology, The City College of New York, NAC Building 6/207, New York, NY 10031 Tel. 212 650 8389 Fax. 212 650 6268 Email: email@example.com