Dear Teresa,
I tripped over an error in the third registration role. Notice how the first registration started with men born 5 Jun 1886? The third registration therefore must have included men born between 12 Sep 1873 and 4 Jun 1886. (One of my cousins was born in the gap between 12 Sep 1888 and 4 Jun 1886, and he was in the third registration.)
Let me know if I haven't been clear.
Ambar