I bought a used trainer and it came with a trainer skewer. I don't know if it's the original from the trainer.
I've put in the trainer skewer and have mounted my bike to the trainer. However, I noticed that the skewer ends don't go all the way into the cup at the mounting points. It's most noticeable on the side with the quick release.
You'll notice that the cup even has cut outs on both sides for the quick release lever, but the qr stem end is only half way in.
Should I be concerned? I've done a couple of training sessions and the bike was totally stable.