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By the sound of your reply, the eyepiece needs to be rucked in more than the current set up is allowing. The image gets smaller and tighter as it comes into focus. Do try Allan's suggestion. It may allow the eyepiece to be rucked in the required amount.
When the image is way out of focus, you will see the shadow of the secondary and of the vanes of the spider that holds the secondary mirror in place. When the image is in focus you won't see these.
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