MASK Slingshot 100% complete w Ace Riker Ricochet helmet M.A.S.K. Vintage 1986

In good condition but I can't figure out why van roof won't stay all the way closed. I never had this as a kid so I'm not sure exactly how it is supposed to work. There is probably a YouTube tutorial on how to fix it :) Includes all parts (I forgot to include the yellow missile in the main photos but it is included - see last photo). See pictures for details.