Simple Square E14 Lampshade

See 2023 update below
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I had a slight accident while I was hoovering the bedroom yesterday. As I moved the bed out to vacuum underneath, my bedside lamp fell down and got squashed between the divan and the bedside cabinet.

"Oh, golly!", said I. "My goodness!", "Oh flip!", and so on. Actually, I think I might have been a little stronger than that in my word selection. But you get the idea.

In short, The lampshade had had it. You can see the result in one of my pictur