If I am to understand you correctly, the divider needs to be pushed in or pulled away from the internal housing? When I put in my rebuilt water pump in the fall, along with hoses, thermostat and radiator cap, there was some kind of sealer between the two that I peeled off,cleaned up, so I did the same again. I think I put a sealer on the dividers to keep em from moving around and in place next to the internal housing. When I parked it in the fall, on the way to storage it ran sluggish and the temp was going up.
