Here's version 1.0.
The vac tube has a piece of 1" tube shoved into it. That fits into the 1" slip coupling that is glued to the top of the cannibalized turntable, with a 1" piece of tube sticking out underneath. I tack the pvc into place on the cannibalized turntable with super glue, then the epoxy makes a very strong structural bond.
Underneath, another piece of vac tube connects the output to the actual record vacuuming arm's mounting.
It's a little overexposed but the three things on the right are the small Last brand brushes. They are 10 for $30, and work great if you have a nice vacuum port handy to clean them constantly 8-) One for dry preliminary dusting, one to wet scrub, and one to post-dry after using the vac.
This little shop vac is TOTALLY too powerful. I'm shopping for smaller canister vacs that I can stick entirely in the wooden base at Goodwill and Salvation Army.
The central clamp is absolutely necessary. Otherwise the record just flies up and sticks to the vacuum arm. Much easier to turn the record around by the clamp than by the platter or the center of the bare record.
It's a piece of 3/4" mdf cut with a router and circle jig, with a piece of tool chest drawer liner glued to one side with 3m spray adhesive. It's not easy getting the center hole right, it's basically 5/32" but in this case the black rubber layer is what's really gripping the spindle.
When the record vacuuming arm is out, you have this very handy vacuum hole. You can easily clean/dry your brushes on this orifice. Actually, having a little hole of powerful vacuum like this is pretty much the biggest improvement over cleaning records totally by hand.
Here's the underneath view. The pvc you see is totally fixed and stationary. The pivotable vacuum arm on top slides inside the 1" tube you see underneath at the top right.
Here's where the magic really happens. The vacuuming arm is actually not connected to the vac tube at all.
It is just set in there, riding on top of the 1" tube that is shoved in from underneath. When the vacuum is on it firmly pulls the elbow edge down onto the edge of the tube that connects to the vac tube underneath. This sets the alignment of the whole arm over the record.
So while you're using it, you leave the arm assembly out. Then you can clean your brushes constantly on the vacuum powered port. Then when you are ready to dry, you just plop the arm in and go around a few times and the record is bone dry.