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Convincing the hardware store SRSC that you can indeed cut 1.3m * 1.36m triangles for the corners from a steel roll that is only 1.2 metres wide. Finally a real world use for all that trigonometry we learnt at school!
Took me ages to realise that the Sirius Dome ring for the 2.3 metre dome is 2.34 metre diameter - then it all worked out!
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