As with all pattern cams or removable cams there is a follower that traces the shape of the cam, then turns it into the pattern via the linkage inside the machine. That machine will have a follower that moves up and down to ride on each different cam.
It should not matter if it's glued so long as the glue does not block the follower from tracing around the cam or moving up and down.
Oh and the plastic gear in the lower right of the second picture is also broken.
Joe