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You need to learn about offset of the secondary when using a laser collimator (I'm sure one of the others will point you in the right direction, or do a search in the beginners forum, there has been some very good explanations about offset and lasers there in the past)
The locking screws are there to theoretically stop the primary moving once you have it collimated, but personally I just loosen them and leave them, they don't seem to much good. Other peoples milage may vary, as the Americans say.
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