Winding up

I put the key into its hole and turn until the spring tightens. Straight away an unseen mechanism takes up the tension, easing it away little by little. The next day, I put the key into its hole and turn until the spring tightens. The mechanism clicks, and somewhere I will never go, something happens. If, one day, I do not turn the key, the spring will slacken and the mechanism will slow and stop. I would never do it. But I might, any day now, put the key into its hole and turn and turn and turn until something snaps.