try a new cup!
Jay3000,
My solution on my 87 300 SDL (assuming the door panel is similar) is to use a coffee cup with a handle that is only attached at the top of the cup and with a gap towards the bottom. It slides over the edge of the storage compartment in the door. I have found 3 inexpensive stainless cups like this. 2 fit great, 1 is a little tight.
Chuck
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