Original weir on 10 year old pool. Recently it's decided to remain open when the pump turns off. All the bits that were in the basket then flow back into the pool. I've taken it apart sveral times, looked for rough edges on the door and frame, but all looks good. It is a fairly close fit on this skimmer, but always has been. Thinking maybe it might be slightly warped and I can't see it. Any suggestions before I spring for a new one? Thanks!
