This:



Is slowly coming loose. Is there anyway to make it not come loose or put it back down tight again?

 

Depends why its coming loose.Its held on by prolly 8 or more metal tabs that insert into slots in the fiberglass door. If the tabs have pulled out of the trim you might as well order a new trim piece.You could try to glue it in place. Pull the door panel,remove the mirror and loosen the three bolts that connect to the triangler bracket the mirror atatches too.You can then remove the window trim and see what the problem is.hope this is any help.