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www.mobilehomecar... has some information on common toilet problems and possible solutions.
How to Repair Common Problems with Toilets, Sinks and Tubs : Home Improvement : DIY Network
How to Fix a Broken Toilet Handle
??? Really ??? Punch a hole in the top of a bottle of vinegar and sit the bottle in your toilet tank. In doing this you will save water, as the tank wont fill as much, the vinegar will clean your toilet AND tank on each flush, it leaves the bathroom smelling fresh and it doesn't harm any component of your toilet OR the environment when flushed. And won't hurt the dogs when they drink out of the toilet like the blue stuff does.
How to Save Your Phone from Water Damage