for lvl 24 an the other line one click and hold for like a second on one of the bodys and when you drag across the line if you mess up the bodywill not go back down[you have hld the click for the whole way and click hold the body each time]
i made my first working jet and i mostlikely used an already know secret but alwell yay to my first jet the flight time makes up for the crappy lookin jet