I just got a rena xp4 for free. My problem is a cant seem to get it to prime up. I removed the impeller and had a look at it and I noticed there was a rubber band wrapped around the part underneath the white fan type piece Im assuming to keep it from spinning but IDK, is this piece suppose to spin or stay firmly in place. Im hoping I can just fix this and get it back up and running so I wont have to buy an impeller assembly. Thanks guys.