OK. The new chamber finally arrived along with the 8″ conflat blanks and gaskets:

Right off the bat we have trouble, a nick on the knife edge of the 8″ chamber conflat:

Today I’m going to assemble the chamber and pump, and see how low we can go despite the nick.
The next step would be to weld on a fresh conflat.
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going to have to wait for some nuts and bolts to arrive first.