I do have a very early T1.3 (single digit serial number) so it may have some quirks some later batches don't have such as the stupid strong clamp it had out of the box (strongest of any Beyer I've owned and one of the strongest clamps I've experienced in general). I've noticed with early batches of a new model from Beyer, they may do some quick changes. I believe they reduced the clamping force on later T1.3's. Whereas say the DT 1990 had a quick pad revision where both the analytical and balanced pads changed from the first batch.That's fair. Any time you take a headphone apart, it might not go back together as tight.
Mine is a little looser, in terms of, the earpads can be rotated without having to remove them altogether. But it's not loose enough to allow vibration.
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