I pulled this from and old post from 2003 of my trunk mod thats still workin just as good as the day i made it.
ok i got bored here in pa in the rain today, and i think i may have gone over board on my hump storage mod. i used a piece of piano hinge on the narrow side of the hump (Note: i had to trim a little off the mounting base end so it would pivot without hitting the hump) then i took apart the door of one of my wifes old cat carriers it has a nice small spring latch thingie that holds the door closed. a couple of quick bends in the spring loaded rods and i was ready to go. i cut two small channels in the mounting base and drilled a nice hole in each of the pillars for the spring loaded rods to slip into and wollah im done. two pop rivets to hold it to the base and works like a charm, and it hold it shut tight.