This may sound kinda off-the-air but it works: find a hairbrush(or similar item) that will fit it the tube. Tie cord/fishing line to it and push it down the tube. Pull out and repeat a couple times.
John Barton is contributing to your thread, so he can say if this would be a problem in one of his older cases.
Several years ago, I received similar advice and ruined an old case (not made by JB). It was working pretty well and I went in for one last pass. Unfortunately, in many case designs, the only attachment for the insert is at the top of the case. If your brush snags the fabric as it did for me, you'll be buying a new case. I was subsequently advised that since the padding was only attached at the top, I could cut the insert out using a mat knife, remove the brush, and reglue the insert. That also didn't work.
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