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Well, after all that, it didn't solve my focus problem.
I decided to open up the side of the box and discovered the focus mechanism actually had an issue which was stopping it achieving full extension.
I fixed that up, and put the PST back to its stock standard configuration again.
Success! All eyepieces now work and achieve focus. The WO 20mm eyepiece is noticeably better than the included 20mm that came with the PST. The proms and surface details seem sharper.
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