While I'm sure you don't want to go around stabbing your brand new accumulator, this is a relatively decent test of an accumulator sphere. You can do it at the junkyard, etc.
Take the rubber end of a #2 pencil and insert it into the sphere. It should go down about 2" before stopping and hiring the diaphragm, it'll go down about 6" when the diaphragm has failed. Give it a couple good pokes, a good sphere will have a strong membrane that the rubber won't pierce. When they're weak, the rubber tips pops right through.
This is a good sphere:
This is a bad sphere:
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