Focus Fix :
My EQ5 polar scope wasn't tuned properly. I wasn't able to focus the star and the reticle at the same time. The reticle is fixed at it's position, ans focusing means moving the eyepice. But when moving the eyepiece, the reticule isn't at the eyepiece's focal point, and isn't focused anymore. To fix this issue, I just added a small plastic spacer (about 4mm) just behind the lens. Reticule and star focus are now much closer.
A few picture to explain :
Without the spacer
The lens unscrewed and the plastic spacer
The spacer inside the lens thread
The lens screwed with the spacer