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If the screws contact the snout nearer one end or the other of it you are much more likely to get some tilt than if they contact the snout close to half way along its length. The screws need to be tight, no slop whatsoever. It is fine if the screws hold the snout to one side of the focuser tube as long as the snout is hard up against the tube for all of its length.
raymo
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