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PST mods #1
Suzy_A is a 100% right!! FOR THE ORIGINAL PST WITH THE GOLD COLOURED front ERF. If your's has this golden colour read on.....
If you look into the eyepiece holder you'll see the "red" blocking filter; this is the important part and MUST be retained.
To prevent scratching during removal I made a "oil filter" type clamp by putting a couple of turns of a narrow nylon tie-down tape around the eyepiece holder then inserted a long flat stick ( 12" wooden ruler in my case) into the tape and then held the end of the nylon tapeat the other end of the ruler. By positioning the ruler about two inches over centre you can get a good "torque" on the tape/ ruler which will grab the eyepiece holder and allow it to be un-screwed.
Remove the spacer piece as Suzy_A says and re-attach the eyepiece holder.
Maybe I had adjusted the internal prism ( which focusses the PST), don't know, but I didn't have any interference condition.
You may find the eyepiece has to be positioned a little out of the eyepiece holder to achieve visual focus, but no big deal.
On the newer or "repaired" PST's with the BLUE front ERF I found there's an additional filter ON THE BOTTOM of the eyepiece spacer tube; so the above doesn't work!!!! This additional filter MUST be retained!!!
Interestingly I found focussing a webcam on the original impossible without removing the spacer, but after repair ( with the blue ERF+ additional filter) it now DOES focus with the webcam??????
Screwing a x1.5/ 2 barlow lens in the front of the webcam Mogg adaptor should work either way, as suggested by Sheeny.
I'd be interested in knowing whether or not you have a "Gold" or "Blue" PST
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