Is the micrometric Screw length on the swan neck not too short?
Is the
non-functioning micrometer screw too short?
Yes. Are you going to get a longer one if you return it to the factory?
Most likely not. These things are made in batches (and huge batches at that). You want to go bother the TDs for that? Be my guest. I know a few people rejecting their PAM111s for that, and then getting samples with other issues like wobbly crowns, dials slightly askew, scratches on the case. AND still with the short micrometer screw.
I'm just offering my opinion. Best case, you'll get a marginally longer screw but still short of the dagger. Worst case, one "problem" becomes a real one or two.