The only way I can imagine the side brush not staying on is if the screw that holds it on is missing. Find a similar replacement screw. Did you get a package of replacement parts with your's? I did with mine, but I bought it many years ago now. While that brush is off, unwind all the thre4ad and hair that's wrapped in that section The brush will turn more easily without that all packed in there.
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The only way I can imagine the side brush not staying on is if the screw that holds it on is missing. Find a similar replacement screw. Did you get a package of replacement parts with your's? I did with mine, but I bought it many years ago now. While that brush is off, unwind all the thre4ad and hair that's wrapped in that section The brush will turn more easily without that all packed in there.