I believe the hatch on my '91 TA is rattling more due to the pull-down fix my friend and I were so proud of. Because I could not afford a $300 replacement or wanted to risk $150 for a junker piece, I decided to follow suit with a couple other people and make the pull down motor stationary at the right level; by drilling and installing screwes along the rails/guides. Would this cause the hatch to rattle significantly more than a stock pull-down set-up? I see no difference if the hatch is secured and locked. The rattling is going to be the end of me!

 

If the plastic housing is broken then it will rattle also even when in the locked position. It's possible you broke the housing more by puting extra screws in to it.