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added section for mushrooming
75 cl and 150 cl bottle have the same size opening and 3-9 l bottles have a larger, but consistent, opening. Some MTFers have used normal beer corks in large format bottles while others recommend sourcing larger corks<ref name='MTF Large Format Corking'/>.
===Mushrooming===
"Mushrooming" is the perception of the compression of the top part of the cork that protrudes out of the bottle. Some people believe that this compression is due to high carbonation in the bottle pushing the cork out of the bottle, which is held in by the cage. However, in many cases the cork may not actually be compressed, but appears to be compressed by the cage (see [http://www.notcot.com/images/2009/09/gatinoismain.jpg this image] for an example). A more likely explanation is that the lip of the bottle compresses the "leg" of the cork, making the top portion look like a mushroom. Some people mushroom the cork manually with a benchcapper, while others say that mushrooming is not necessary. See [https://www.facebook.com/groups/MilkTheFunk/permalink/1920123874682484/ this MTF thread] for more information.
==Videos==