John,

You can remove the handle by removing the hex screw on the bottom.

Then you'll see a small screw head on the end of the cartridge. Turn the brass piece by hand to the hot side. You can tap on the end of the screw lightly and it will shake free the sediment on it which is prevent it to open properly.

rick

__________________
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them.
Thomas Jefferson