Hi All! I have a HC3315 chlorinator and I’m trying to figure out if one of the protrusions at the bottom of the housing that keeps the filter screen in place is missing. I only have three protrusions so I believe the filter screen is not being held in place properly as it would be with four protrusions or Dots that extend up from the bottom of the housing. Can anyone tell me the correct number of protrusions that should exist at the bottom of the housing?