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I didn’t take any measurement. I just had these straws for the children they don’t use (plastic one are forbidden now in Europe) The size I use is roughly 7mm OD and 4 to 5 mm ID.

I personally cut a bit of a silicone straw. It fits perfectly around the thinnest part of the glass. It prevent the stem to go down all the way. It is the same with the stock stem I dont like it slips down too easily when drawing

Thanks a lot! I will have a look

Hi there ! In the event you would be interested in selling it, be advised that I would be more than happy to repurchase it from you even at its original price + transport. Been hanging around for a while and there isn’t so many for sale.