The instructions say to "attach door bracket to closer tube with long connecting pin. With door tightly closed, hold closer and door bracket against the door in a level position. Pencil outline of door bracket onto the door".

Does that mean the closer tube should abut the door jamb bracket or the closer tube can be inches away from the door jamb bracket? Or doesn't it matter?

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The instructions say "turn adjusting screw counter-clockwise for faster or clockwise for slower".