RoosaMaster advance piston stuck

JDB pump off an Onan/JD generator that I"m using as a learning project. Obviously the advance power piston is stuck. I"ve read a little about this being a somewhat common problem with the ring breaking up and holding the piston in. Am I correct to assume that I need to replace the assembly?
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thanks to a tip, I stuck the assembly in the end of a large 12pt deep socket, hit the socket hard on a steel bench and was able to get the piston out.
 

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