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I own a swag of Televue eye pieces
You probably can’t focus due to possibly the following-
1/ Televue eye pieces ( including Delites ) have an adjustable barrel to allow you to slide the eye piece top section and guard in or out to find your optimum pupil distance. Try some different settings ( there should be instructions in the box )
2/ The moon is at full moon phase now and extremely bright which can cause havoc with your vision ( not the eye piece) Make sure your using a good quality moon filter on your eye piece ( best time to observe the moon is around 40% to 70% waxing or waning )
3/ Try focusing on a bright Star first , like Sirius or Rigel Kentaurus, you should be able to see diffraction spikes leading away from the core of the star once you have tight focus
4/ Check collimation of your dob, very important !!
5/ Do you suffer from Astigmatism in one eye or both ?? You can’t correct focus with Astigmatism. You can only correct focus with your telescopes focuser if you suffer from myopia ( long or short sightedness
Televue have an accessory called Dioptrx which can help with Astigmatism
Hope the above is a start and others can pitch in and suggest more ideas and help
Cheers
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