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Dave
A are you using your scope at home if yes then
a) buy a long extension cable
b) a power board with switches
c) 12v 5 amp hour regulated power adapter and get rid of the tank
As to the focuser get rid of the standard Skywatcher one buy a William Optics crayford focuser cheaper than the rest and work well
As too focus buy two extensions tubes a 50mm and 100mm as sometimes their isn't enough back focus to bring the scope too focus
PS: IMO don't trust DSSInspector depending on what settings etc you give it such as monochrome or bayer image, what size camera pixel you input, focus length of scope, whether single or multiple images, whether image stacked with a dark, these will all retrurn conflicting results
look at you diffraction rings in and out of focus to and this will give you a guide as to whether the scope needs collimating
Cheers
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