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Above,scrwing the DEC axis

Now you can align your mount in DEC. The good news is that you need two follow the same method as the RA alignment. Of course this time you need to adjust your scope in DEC, North and south.
Instead of the azimuth you should find at least a star along the Eastern or Western horizon and at 0 degrees DEC. 0° Its' not mandatory.
After the DEC adjustment, check the RA adjustment. If everything still ok, the job is done!
To increase the accuracy of the alignment I repeated the job with a total duration for each axis to 250s
Keep in mind that the smaller your CCD field of view is, the higher your mount alignment will be. That mean if you imaging at F3.3 or 6.3, perform your alignment at F10!
After this alignment I can imaging up to 300s (5mn) without guiding and I took exposures up to 30mn with guiding at F10!