Ok that makes sense now. I took out some of my separated lenses and they look like they've been edge-ground after cementing. So optical alignment is purely angular in a concentric jig. I could technically use the lens body as a jig, after coating with mold release, or the lenses could be held with aluminum tape and aligned with a straight edge. The optical alignment in the video did not look like it required a precision of more that 0.001".
I'm not sure if a vacuum jig can be a helpful air for balsam repair, unless I have the complete optical setup in the promo video.
Attachment 249001
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