On Jun 9, 8:42*am, jcarlyle wrote:
My ASW-19 had two metal airliner type of vents, which swiveled and had
provision to control the airflow. I remember seeing plastic vents like
these for sale within the last few years, but I can't remember where.

They're called eyeball vents. Buy new plastic ones from wherever
http://www.aircraftspruce.com/catalo...ticeyeball.php
(every aircraft supplier has them..) for now, but then shop ebay for
real ones (may take a while to come up in the size/style you want...)
to replace them ASAP. On ebay you can pay plastic prices ($15-$30
apiece) for nice aluminum vents (normally $160+ apiece!).

Some glider suppliers have the plastic ones too. Biggest difference is
that the plastics basically have to be run full-on or off and quickly
lose that ability as plastic parts wear, as opposed to the metal ones
which have infinite flow adjustability via a slick little twist-
activated internal damper.

-Paul

PS. I'm working on a Mandl exhaust vent hatch for ASW-20's and 19's
and should have them available next month although cockpit airflow
doesn't sound like a pressing concern for you...