Just to let you know I use a clamp lamp on a partially opened cupboard door, my tort table is on the kitchen worktop. It's on the bottom edge pointing vertically down, it's never slipped a millimetre. I was worried about the same thing when I got it but it's worked brilliantly.
Concerning the cable ties i'd just put them through the actual clamp for added security.
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pixie, eddie and susannah
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