slice off the top of the cork and use a corkscrew to pull out the remainder, however if the cork is crumbling, push the remainder into the bottle and use a strainer to catch the bits. Not elegant but who knows when it is in the glass
the tapered part of a champagne cork before it is inserted into a bottle is like a wine cork cylindrical and uniform
Never use a corkscrew on a champagne bottle.
The wire collar that holds the champagne cork in place, is known as a 'muselet'.
Then air was leaking into the bottle and it's probably bad.
Carbon dioxide is produced from yeast. This carbon dioxide causes champagne to bubble and the cork to pop.
Champagne corks are shaped like that due to the extreme pressure in a champagne bottle...the shape helps ensure that the cork will not fly out under the carbonation.
Away from your face and supposedly into the faces of others.
My method of opening a bottle seems to work. I use my thumbs on both sides of the cork and slowly move the cork up and working it out of the bottle. I have never had one pop out or shoot out the champagne, but I think the key is that I do it slowly and that allows the pressure in the bottle to become less as the cork is moved up. Or try this (depending on the results you want to achieve): After removing the wire and foil, the cork can removed two ways, the "Hollywood-movie" way ("winning-team-locker-room method) which is to grip the bottle at the neck, shake it up and push the cork out with the ends of your thumbs (while aiming the bottle at something that is not living). This will cause a great pop, and you will lose most of the champagne in a great gush. If, however, you actually wish to drink the champagne, then open it the civilized (classy-restaurant) way, by wrapping a tea towel around the neck. Hold the end of the towel over the cork with one hand, while tilting the bottle slightly and aiming it away from living things, then, while gripping the cork with the toweled hand, twist the bottle (not the cork) with the other hand, and voila! The cork will pop out, and most of the champagne should remain in the bottle if you have chilled it sufficiently and have not shaken the bottle.
The wire cage is to help hold the cork in place against the high pressure inside the bottle.
That is a tough one. I push it down through the neck so it goes into the bottle. If you keep working on the cork it begins to come apart and then you have bits of cork in the wine so it is better to have a whole or part of a cork in the wine rather than bits that you have to fish out.