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I have an inset though its not the same as the one on the link, works well but tends to attach itself to cups so you have to be careful not to throwaway with the cup. Could probably bluetack it in or something but I mainly use it with cans which is not a problem.
Ok, so it was crazy to even contemplate buying this when the shipping was more than the item itself! But it is a damn fine holder and keeps everything solidly in place, even during an 'acceleration test'.