I have a two year old Glacier Bay kitchen faucet with pull out spray head. Recently the faucet is very difficult to pivot, so much so that the base plate on the sink twists when you try. I uninstalled, cleaned, lubricated and re-installed the faucet and it is still the same. My trip to Home Depot was only partially helpful, as they remembered this problem occurring before, but not the solution. Any ideas or shared experiences?