The gutter that crosses the front of my house was installed with the pitch going the wrong way. They apparently were going to install the down spouts at one end then the builder changed his mind and installed them at the opposite end without considering the pitch.
These gutters are installed with gutter nails, those 9 inch spikes that nail into the fascia.

My Question:

How can I change the pitch of this gutter without a complete re-installation or removal of these spikes?