Originally Posted by busdriver1959

There are two different types of QR, internal cam and external cam. A vintage Campy QR is the internal type, you can't see the cam itself. A lot of aftermarket QRs are external cam along with the newest Campy ones, you can see the cam. External cams don't seem to have the same clamping force as internal cams and shouldn't be used on horizontal dropouts. Go with a vintage internal cam.

Originally Posted by kasperbs

My wheels are Campagnolo Zondas and the skewers are stated as "cold-forged aluminium". I think I have found a spare skewer which is pretty heavy and feels like steel. I will try that tomorrow.