Once you take the doorskin off, you'll see how some plastic components inside are glued to the inside of the doorskin. Over time, the glue begins to crack and you begin to loose that "solid" feeling as rattles start to be heard.

I bought:

Craftsman 40 Watt high temp glue gun (Sears item# 80421)
Craftsman All-Purpose, Superior Bonding, .44" round glue sticks (Sears item# 80454

and added glue where it was neccessary. I felt that the heat from outdoor parking would require a more "heavy duty/high melt point" glue.

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Previously owned: '03 4.6iS Dinan Supercharged