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Welcome to IIS
1 - Sorry cant help there
2 - Does its have threaded hole for locking screws? As long as the springs on the collimation screws are stiff enough you shouldn't need locking screws, I took them off my lightbridge.
3 - Once the secondary is aligned properly you generally won't have to adjust it often, normally just the primary.
4 - Not sure what finder comes with the skywatcher, is it a straight through? A Telrad or rigel quikfinder (1x finders) can be a very handy addition for putting yourself close to your intended targets. With eyepieces etc I recommend getting used to using what you've got for a little while and find out what you like . I assume you've got a collimation tool, other things are red torch, star atlases etc, observing chairs are a great addition too...there is a lot of things you can spend money on, so go slow.
With a dob, in the future you may look into making up manual setting circles to help locate fainter objects.
Cheers
Jeff
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