I discovered a 1 1/2" Street Elbow - - a 90º copper elbow that has only one
opening expanded - -works well with the very effective vacuum hood for the
K3 Master Pocket Hole System. The expanded end almost fits the hood, and I
figured I could improve that with a little sanding, and taper the smaller
end to fit the hose. The elbow makes the vacuum connection more direct and
eliminates the tendency for the hose to pop off the snap-in hood.