I have an Abus disk lock that has the key broken off deep inside. It is the version that has a hole in the back behind the keyhole, and in the past I was able to just stick something in there and get the broken part of the key out. This one is stubborn and not moving at all. Any suggestions?
It all depends if the lock has a regular type key or the pick proof type key. Sometimes you can pick the broken key out of the lock if it's a regular type key lock. If it a pick proof type lock, cut it off. You'd be surprised at how easy the ABUS locks are to open.
I have a “key extractor” set that I have had good luck with several times. Different shapes and sizes that you stick in the lock and then pull the broken key piece back out.