I’m following GF’s guidelines by posting this here, as they have requested this type of information not be posted in other areas of the forum.
Supporting image related to:
Taken completely apart and measured independently, I calculate a technically feasible travel distance of 0.485" for the focal lens in the head on my unit.
In practice, when it is fully assembled, I measured the distance it travels between its two extremes at ~0.470".
A rough 3D model of the head assembly can be found here, in case any wishes to compare my measurements to their own.