There may be something stuck in it. Fill the tub with water and pour some dish washing soap at the connection of the two pieces. get a towel as you will make as BIG mess. Start slowing pumping in back and forth with cork ball end in tub. You will be slowly flushing all the crap out of it. If this doesnt work it may be toast. It just got my Hotstick back in like new shape.

Doug