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.