Anybody ever replace a NHK stabilizer cartridge

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I've got a Denton non-rebuildable stick stabilizer and it's an NHK cartridge. Has anybody ever just bought a new cartridge for it? Where did you get it and how much did it run ya?

when i first bought my noss machines stabi. for the 400ex, i was told i could buy a new one from noss machines for about $45. it uses the same nhk cartridge