Near the center of the image below is the new cable feed through. It has solid metal pins instead of a flex cable with insulation. The insulation on the flex cable is one of the expected sources of vacuum leak (see December 7th post). The metals pins are surrounded by white Agilent Torr Seal epoxy. This epoxy is specifically formulated for vacuum applications with very low off-gassing.

The epoxy should finish curing by tomorrow morning and I will test it. I have high hopes.