In article , Grant Erwin says...

Normally a design incorporates LH threads where normal use would loosen
RH threads. For example if a lever were mounted on the top left of a
toilet tank such that the lever were to the left of the mounting screw,
operating the lever normally would tend to unscrew it. Since most toilets
I'm familiar with have flush handles like this, perhaps that is the reason.

Yep. If you think about it, pushing down the lever has to work
against the force of lifting the valve off the seat - by pulling on
the chain.

So the plastic bushing that fits in the hole in the tank is trying
to turn left at every flush.

Jim


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