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You need to do some surgery to the PST...
The problem is that the focal point is not far out enough to allow imaging, so you need to remove a bit of the PST.
Ther black eyepiece holder needs to be removed. This then comes apart into two pieces. Remove the piece that is closest to the body of the PST and then put a 3 or 4 mm washer or spacer or something between the eyepiece holder and body and screw the eyepiece holder back in.
If you don't put in a spacer the metal part of the eyepiece holder will hit the prism in the body of the PST and put a big scratch across it....
The threads are sealed with lock-tite or something like that so you need to use a bit of strength and a lot of care when you do this or you will scratch the aluminium, although this is only cosmetic. If you can't do it by hand, wrap some masking tape around the tube of the eyepiece holder and then use some multi-grips or something to undo it.
Obviously, if you do this it's all up to you. I had to find this out the hard way, but if you are careful and make sure theer is enough clearance between the metal bit and the prism, then it's no problem.
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