Piston rings are very brittle. They snap easily and are only sold in a set.
There is no special tool that I know of.
You have to open them up and slide them over the piston. Do not twist them or they will snap. You will probably need a thin flat head screwdriver.
Be patient and don't rush it.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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