Nic and I discovered a problem with the in-vac wiring from the feed-thru to the top of the table.  Pin 13 at the top of the stack, which is one of the coil pins on the tip-tilt quadrapus cables, is *the* shield braid on the cable that goes to the feed-thru.  This effectively shorts one of our coil signals.

There are three solutions as we see it:

* swap pin 13 for something else at the top of the stack, and then swap it back somewhere else outside of the vacuum.

* swap *all* the pins at the top of the table to be the mirror.  We would then need to mirror our cables on the outside, but that's less of an issue.

* make a mirror adapter that sits at the top.  This would obviously need to be cleaned/baked.

None of these solutions is particularly good or fast.