I owned a Saxon 8" dob and found that there are 2 allen head grub screws on the topside of the focuser barrel. You will need to loosen off the 4 screws under the R+P. Then very carefully tighten the allen bolt closest to the scope' tube until you feel resistence then back off 1/8th of a turn. Do the same for the other allen bolt. Go back to the first one and tighten until you feel resistence then back off less then 1/16th of a turn. Do the same for the other allen bolt. You can then tighten the 4 screws under the R+P, closest 2 first until you feel resistence then the back 2. If the focuser movement feels sticky then remove the R+P screws and remove the focuser barrel. Clean the barrel with metho and give it a good gloss with car wax. Reinstall the barrel and R+P.
Cheers!
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