It's basically impossible to put the rubber tube gasket back on the bottom plastic sleeve without removing the plastic sleeve from the hole. I struggled with this for the past week but I finally figured it out. While the plastic sleeve is in the hole, there should be a little room to lift it up slightly, enough to get a flat head screwdriver in there. There are basically clips which hold the sleeve in place on the sides. See attached photo and where arrows are pointing. You need to push that inward and in the same motion lift up with that screwdriver. Do one clip and then do the other and it will come out of the hole. Then you can put the rubber gasket back on much easier, then just push that plastic sleeve back in the hole.
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