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I followed the advice about the secondary screws, centre spotted the primary and used a cheshire eyepiece to see how much out of adjustment the primary was. The primary definitely was out of alignment so I loosened the screws holding it and forced it to move to a closer alignment. I then noted the direction each screw moved , removed the primary and filed the holes in the directions indicated. Then refitted the primary and carefully forced it into alignment whilst observing with the Cheshire. Tightened the screws and added a ring of electrical tape between the primary holder and tube. Now this little scope gives quite respectable images at low power , using better eyepieces.
Regards philip
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