First take the cam follower assembly and insert a penny into the slot in parts 13 and 17. Next apply glue to the one loose flap and glue it to the base. The pivot point for the cam follower should be the outermost point of the guide lines on the base, not the middle.

Do the same for the other cam follower assembly.



To adjust the cam followers so they work properly, test them by spinning the handle. If the top parts fall down the side of the cam, pull them back up and while holding the lower segment, twist the upper half inward. See the pictures below for a clearer explanation. It also helps to bend the cam itself, lightly press the shorter side so it curves.



Take parts 27 and 28, apply glue on the back side and fold them in half. Be sure that you pull up the flaps on the ends, don't want them glued together. Apply glue to the remaining exposed back side of parts 27 and 28 and glue them on parts 15 and 19 respectively. You want to position them so that the edge of the part you are attaching lines up with the edge of the seam near the end. The pictures should make this clearer. This step is done now because you may need to change their position based on where the slits in the top flap of the base are.



To build parts 10 and 11 glue them to look like an inside corner. To attach them to the base, apply glue to the bottom of the part (the smallest complete side) and place it on the inside guide of part 8 so the side sticking up is against the cam follower arm. These parts are meant to help with guiding the cam follower arms if you are having difficulty with them. If they work fine before these parts are installed you will want to glue them in place so they don't actually touch the cam follower to reduce friction.



Finally place parts 5 and 6 so the shaft goes through part 2 in the top flap and apply glue around the edges of the top and glue it closed. Position the inside as you do this so parts 28 and 28 go through the slots in the top and part 6 rests on the axle between the cams.