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DSB - shining a torch on the mirror surface is a sure way to scare anyone! It's amazing how terrible they look - covered in specs of dust!
About the miror lock screw - watch out when following Andys Shotglass video. Last time I looked he is speaking about adjusting the primary collimating screws but the image at the same time shows his fingers on the smaller miror lock screw.
Les, I was at at Yerrinbool at a Summer School - a bit further away than Bargo from the massive Sydney skyglow (but a bit closer to Mittagong's sky glow). But still nice after midnight.
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