The O-ring pairs which seal the septum plate to HAM5 and to HAM6 have passed leak testing -> Leak testing was done with HAM5 and HAM6 vented and their North and South doors removed (effectively) -> The annulus pump ports to these removed doors were plugged with No. 0? 1? rubber bungs (stoppers) which allowed the annulus volume comprised of the HAM6 East door, Septum plate and HAM5-Spool flange and connecting piping to be pumped out with the LD -> Helium was sprayed around the outer septum O-rings with no response -> The ultimate test was the demonstration that the HAM5 annulus ion pump (unassisted) was able to overcome the total gas load of this configuration -> ion current starting out at ~10mA continually decreased to 3mA over the course of two weeks