safety thongs.jpg
you'll be fine, get a pair of these, put your best suit on and make sure your chin is over the spear as you unscrew.
then if the spear comes out too fast, your chin will stop the spear damaging the roof.
don't forget the safety glasses, they are obviously designed to stop a stainless steel spear at 100kph :))
lay the keg on it's side
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