You just have to go get a different key made. Sorry :(
Most keys are brass and I have never saw them put back together.
To retrieve a broken key from a lock, you can use broken key extraction tools like key extractors or tweezers to carefully remove the broken piece from the lock. It's important to be patient and gentle to avoid causing further damage to the lock.
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If the key is broken off in the ignition of the 96 Crown Victoria it will have to be picked out. If the key is out and broken, a locksmith can use the broken pieces to make a new key or rekey the ignition.
Broken Key
You cant repair a key if some part of the key is broken. And if it is broken then it is better for you to order your new space bar key from a key replacement company.
One way to retrieve a broken key from a lock without using tools is to try using a magnet to pull the broken key out. If the key is magnetic, you can try sliding a magnet along the keyway to attract and pull out the broken piece.
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To remove a broken key from a lock, you can try using tweezers, a key extractor tool, or a small flathead screwdriver. Insert the tool into the lock and carefully pull out the broken key fragment. If the key is stuck deep inside, you may need to call a locksmith for assistance.
NOOO get the broken key out of the ignition by pulling the black protector off and then take your key to a key maker and have him replicate the toothing from your key
See You-Tube Video : http://youtu.be/lBNUuO4ldfI How to Remove a broken key from an Ignition. Using the Broken Key Extractor Kit from: www.WedgeCo.com
To replace a broken key in a 91 Subaru ignition, you will need to contact a locksmith. The locksmith can cut a key to match your ignition.
If you can see the broken end of the key, sometimes a straightened fine fish hook can be inserted and "grab" on to the brass of the broken key. good fishing! EGAD