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a couple of mine have needed adjusting. The lens holder screws onto the barrel for focusing. The locking ring will stop the lens from adjusting fully inwards, so get it out of the way by screwing it as far as it will go towards the eyepiece end. You should then be able to adjust the lens to focus - and then screw the locking ring back out until it locks against the lens assembly. The lock ring tension will throw the focus out slightly, so you will need to play with the lens setting a bit.
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