Mathieu, Thank you for your second response. You are quite correct! The first 44 seconds of the video are fuzzy on my machine, but after that the image sharpens up and I can see the screen. The video comes into focus directly after the command changes to 'Cylinder Solid', I presume the command before that is 'Slab Solid', but its not easy to define. Thank you once again for your help. Regards Phil
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