The clamping nut that holds the pinion in place can only be fixed and loosened with the original VW tool.
At the Volkswagen dealer you could order all specific Volkswagen tools at the time, you needed the order number which was found in the workshop manuals. For this specific pinion nut socket this was not much different but what do you have to do if the specific socket wrench is no longer available?
Fortunately, there are always companies that pick this up and provide you with a very good reproduction. This pinion nut socket is in terms of shape and certainly also in quality equal to the original.
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