Now, that's a cannon!!!
First of all. Ignore the bubble in the mount head. It's useless and doesn't help.
Secondly, you will need that 12 degree offset for your polar alignment.
But you'll probably also need to ignore setting your latitiude on the scale on your mount, since they are also not as accurate as they should be. Mine is out 6 degrees on my SkyWatcher EQ6
Use your inclinometer and fine tune from there.
You will, however, need to go between a star fairly high up approaching the northern meridian and one low in the east or west close to 0 degrees dec to tweak your alignment.
There are plenty of good sites for how to do this, but I really enjoyed a drift align simulator which has already been posted here at IIS.
If I can find it, i'll post it.
Good luck