newshound wrote:
I have a key broken off in a standard yale cylinder lock. It still
works with the half key. Any bright ideas for removing the other
half? I would quite like to "save" the lock because several family
members have keys.

Newshound,

If you have a metal-jawed vice (or even a couple of thick pieces of flat
metal), take the barrel off and try tapping the front of the barrel on the
slightly open jaws (or onto the separated pieces of metal on the bench) [1]
to 'vibrate' the broken bit of the key out of the slot slightly and then
grip the exposed end of the key with a long-nosed pliers and extract it.

That's worked for me in the past.

[1] Opened just wide enough to allow the key to pass through them but not
the front of the barrel.

Cash