Georg, thanks for doing the hammer test. It looks like the test is of no use if there is damage to the outer part of the rim. In the near term I will be refinishing a set of Campy wheels and will test all four when the tires are off. Based on this episode there is no guarantee that the wheels are good if they all sound the same. Contrarily, if one is off it could point to an internal issue.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.