Got a call today from a bar and grill. It is new years eve, and their lock on the liquor close has broken. Key goes in, and just goes around and around.
Went out and found that the tail piece had broken (I knew this before leaving the house but didn't know it was an IC system).
As it happens, I had serviced an IC system earlier in the year, and had another tail. And a core, which had a couple change keys for it, and a core key.
I'm going back to pop in a replacement core, write a bill, and walk out with some money. Just love it when a plan comes together.