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The first image shows the sealed bearing assembly. I slide a 3/8" tube into the end of it.
The second image shows the vacuum head. (Ignore the second foam sheet). I slide the long 3/8" tube through my chuck and tighten the jaws on the dovetail tenon.
The third image shows how I connect my vacuum line to the tube going through my spindle. The 3/8" OD tube is a pretty decent fit and doesn't leak.
The last image is supposed to be rotated but the smc software didn't accept it in the correct orientation. A couple of key items: on-off switch, bleed valve, automobile gas filter (all air going into the pump goes through it. I mounted these items on a piece of plywood that I attached to the left end of my lathe. When I'm not using it, it is not in the way.