If it works well … (Donnie McDonald)
When I was a child my grandfather, an engineer, made for me a remarkable machine. There was a central mechanism, surrounded by a system of cogwheels and gears that assisted in driving and controlling the whole device. I used to gaze at it and marvel at its elegant symmetry.
One day I decided to take it apart. When I attempted reassembly the results were disastrous. I was left with a central conglomeration of components that ground to a halt whenever I tried to set the thing in motion. It was heartbreaking. The device could never be made to work properly again.
Thus I learned how thoroughly foolish and inadvisable it is to dismantle a model that has demonstrated excellence in its operation.