Two different things moved it and they need different answers. Digits in a proportional font are different widths, so 1:11 is narrower than 4:08 and the bar breathed once a second -- tabular figures fix that. The character *count* changes too, at the hundredth minute and whenever the right-hand clock is toggled to remaining and grows a minus sign, which a figure width cannot fix -- so each clock reserves the widest string this track can put in it. The budget is per track rather than a constant: reserving six characters on every track would push the slider in by a character at each end to buy nothing. Measured in the component tier: 4.5px of drift across three positions before, none after. Refs #13