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7 There's a bit of a press fit on the pinion bearings, so it may take a few whacks with a plastic hammer to remove the pinion from the housing. If it proves stubborn, an air hammer and a punch bit can usually make the pinion see things your way. If that doesn't work, it's likely that a bearing froze and friction-welded itself to the pinion, in which case it's time to break out the torch and find someone who is really good at using it.