How do you keep track of how many shaves you have on a given blade? As I have a mind like a seive, and can never remember when I last changed the blade so I have taken to using a die (as in dice) which I place on the shelf in the cabinet next to the razor I'm currently using. After each shave I turn the die to show the number of shaves I've had on that blade. Hasn't been a problem so far as I have never gotten past five on any blade.