Summary: My Koni adjustables have wrench flats just below the adjuster You need to use a deep offset box end wrench like these from Hazet then use either a socket or wrench on the wrench flats just below the adjuster With a mk4 this should work but my Stahlwille deep offset box end wrenches do not fit into my mk3 upper caps
Image Dimensions: 580 x 335
Image originally found here.