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A little word of caution here: be careful with loading the focuser too much - this goes for both items you hang off it and how far out you pull the draw tube. The focuser will flex, the draw tube will sag down, and the chain of gear may not be rigid enough to all keep dead straight. The result will be a poor image as effectively the whole optical chain is out of whack! And you may just be pushing the proverbial uphill. Keep an eye on the integrity of the optical chain. Unless it is secure nothing else you do will improve the image quality.
And over tightening set screws is not the solution either. This just over strains threads (aluminium is very soft), and items can become damaged. Never over tighten set screws. If you need to do this to make things straight, use it as a guide that's telling you things are not good and that you need to change things. There's a lot of over tightened set screws I'm sure in the set up you've posted. And over tightening also doesn't leave things dead straight either as there will be some play between itmes too.
Alex.
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