Static Port Hole Size?

[Doug Rohrer]

I think the static ports on the 9A I recently bought may be plugged. After removing the plastic fittings on the inside, what size drill should I be able to pass through the stock Van's static ports?

[Greg Arehart]

Doug,

The stock ports are simply rivets, so you should be able to pass a drill the same size as the center pull of the rivet (not sure if the proper terminology is the mandrel). Ultimately, I don't think the diameter really matters much as long as there is free air getting into the plastic tube that goes to the instrument panel.

greg