Awh, you're right. When he said switch, my brain shot straight to the electrics. Sorry, I suffer from sometimers. If it's falling out, then the springs are either broken or weren't properly tensioned when it was installed. If new fabric was installed, there's a good possibility it was wrapped on the tube backwards and the springs not wound to put tension on them.
I'd have a shop do the work though. If you're not familiar with the workings of those, a misstep can have it slapping the tar out of you. Not fun. Good luck.
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