A fun day disassembling and reassembling parts of my car. Key would no longer unlock the driver side door, so for the last several months I've been locking and unlocking by climbing through the passenger side. Bought a new lock cylinder, pulled apart the door and removed the old cylinder, took apart old cylinder, and luckily the worn tumbler plates were ones I could replace with ones that came with the new cylinder so I could use my old keys. Cleaned, greased, and re-assembled, no extra parts. Locked and unlocked the door a couple of dozen times just because I could.
I love that feeling of fixing something and putting things back in order. Ahhh...