'03 headlights cant be opened up, trust me Ive had a pair. They used a clear permanent sealant to seal them up. You could always take a dremel and cut the black housing away from the clear front lens. Just dont cut too deep at the top and bottom because the angel eye fiber optic cables are there. There also a member here, Mark, that can replace the adjusters on the '03 headlights w/o cutting open the entire headlight housing.
If your chrome inner piece moves a lot then you have broken adjusters. If your adjusters are good there still should be some play but only a few mm or so.