I just replaced the ballcocks, float balls, refill tubes, flapper valves, and reconnected the water supply in two of my three toilets, and there are no leaks (Once I figure out which is rignty-tighty-lefty-loosy upside-down it's a snap)! I'll finish replacing all the tank parts of my third toilet (the essential one near my sewing room) after my doctor's appointment later today.
DSIL has been such a great mentor to me in household repair skills, and I am everlastingly grateful.
Beverly