Trumpets, trombones, tubas, and other wind instruments have a mouthpiece that is inserted at one end. This small part of the instrument can be twisted, dented or otherwise damaged very easily. If you force the nozzle in, it may not come out. There are a few other things you can do to remove a stuck mouthpiece and to make sure it doesn’t get stuck again like Trumpet Mouthpieces, trombones mouthpiece.
Pull the nozzle with your hand. If the nozzle is stuck, you can try holding it in your hand and turning it a little counterclockwise. If it’s not too stuck, you can remove it by hand.
Gently tap the mouthpiece with a wooden mallet. Use a wooden mallet and make several small, fairly gentle strokes around the mouthpiece (the insertion point where the mouthpiece is attached). This may help to loosen the connection between the mouthpiece and the instrument.
Tie a rope around the mouthpiece. Hold the instrument in one hand and the ends of the string in the other. Pull on the rope to see if the nozzle pops out.
You can also wrap something around the rope, such as a mallet or other object, that will give you more power when you pull the rope to remove the nozzle.
If the nozzle comes out with force, it is likely to fly across the room and onto the floor, putting yourself at risk of further damage.
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Use the hot and cold water method
Place the instrument on a sink. You will need access to very hot running water. Also have a towel ready, in case the water starts to drip too much on the instrument as you work.
Tie some ice cubes to the instrument with a wide rubber band. Use a wide rubber band, like the ones used to tie broccoli, and wrap the ice cubes around the spout. These should touch the insertion point where the mouthpiece is inserted into the instrument. Leave the ice cubes on the instrument for a few minutes to allow the metal to get very cold.
Start running hot water over the nozzle. Run the water as close as possible to the insertion point of the nozzle without melting the thread. As the hot water touches the nozzle, it will begin to slightly expand the metal, while the cooling effect of the ice cubes will contract the metal of the nozzle. Let the hot water run for a few minutes.
Do not put the hot water in the lacquered part (painted with brass) of the main flute. This will cause the hairspray to tarnish or even peel off.
Stop the water and pull the nozzle. Take the instrument out of the sink. Wrap the rubber band around the mouthpiece as tightly as possible. Hold the mouthpiece firmly, use the elastic band as a type of grip, and pull on the mouthpiece.
Dry the instrument and put it away. Dry the instrument carefully with a soft cloth. After ensuring there is no moisture on the outside of the instrument, carefully store it in its case.
Inspect the nozzle for damage. The end of the mouthpiece that is inserted into the instrument must be round and clean. There should be no rust or other debris on it. Hold the mouthpiece at eye level and check for dents or an oval or squashed shape, or compare it to a mouthpiece in good condition.
Use a nozzle repair tool. If the mouthpiece is deformed in any way, use a repair tool to return it to its proper shape. This tool looks like a thin T and has a slightly pointed end. To use, insert the tool into the end of the nozzle. Hit it very lightly with a rubber mallet (not a hammer!). The tool will force the end of the nozzle to round