Many times I have helped people with their GMC and have found that the two screws that turn down to hold the latch do not lift the cover as they did originally. There is (WAS) a small metal clip in a groove that often breaks over time.

I have solved this problem by using a 1/4" lock washer. Just twist it open with vice grips so that it will fit over the groove and then flatten it. You can do this without removing the latch from the cover.

Here a a picture:

http://www.gmcmhphotos.com/photos/g4479-hatch-cover-latch-repair.html

MIne has held for over 10 years now. I would say its a permanete fix.

Emery Stora
77 Kingsley
Frederick, CO

This is a common problem. I've been using a circlip with good results as well.
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Been working for me too, Emery. Mine snapped off three years ago the third time I lifted the cover. Almost lost a finger because I was only using one hand to lift the cover. I did the same fix then and learned to not lift it with one hand anymore.

I solved that problem by attaching a short length of nylon strap about an inch wide from an old backpack to the underside of the rear of the hatch cover. Made a nice little loop that sticks out when the cover is closed. Makes it super easy to lift and replace the cover.