My current thought is to add some blobs of Krazy Glue where the handle touches the case
That won't work... Krazy Glue is very thin, and when it dries will leave just a few thousandths of an inch of material just as hard as the case/handle, and will not reduce rattling.
What you want is some RTV silicone. Your auto parts store will have it. It comes in tubes and is available in blue, black, orange, and clear, and is about as thick as toothpaste when it comes out of the tube. It will dry into exactly the shape it came out of the tube in, and will become what for all practical purposes is a blob of rubber, tough and resiliant.
But before you do that, do as Tony suggested and make sure your springs are present and intact.
tanstaafl.
"There Ain't No Such Thing As A Free Lunch"
_________________________
"There Ain't No Such Thing As A Free Lunch"