In some VW/Audi 01M, 01N and 01P units, you may find after installing the Sonnax oversized TCC apply valve kit 119940-04K that the TCC apply valve sticks or doesn't drop all the way into the bore without excessive force. Sonnax bore sizing tool 119940-BST resizes the bore and gives you the finish and roundness you need to allow the valve to move freely.

¼-20 Tapped hole for use of slide hammer
Allows for successful oversizing of bores

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