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Old 12-08-2012, 11:13 PM
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IIRC the input shaft is not connected directly to the diaphragm, so in theory it should be possible to replace it w/o needing to crack the housing.

I'd start by looking closely under the felt where the input enters the booster for a retainer clip of some sort. Conceivably by removing it, the shaft might come free.

It might be under some amount of spring pressure, so watch out for that.
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