We currently have a mechanical timer for our filter and pool vac. The timer looks like the one in this picture ... http://www.poolcenter.com/T30401R-In...ing-Center.jpg
The on/off switches on the timer for the filter keep coming unscrewed and/or moving, no matter how tight we tighten them. Is it possible to remove these mechanical timers and insert digital ones into the same box, or would we need to completely replace the box with digital timers? Also, any ideas as to cost to replace the timers with digital ones?