Okay, so I've been putting off repairing the infamous "stuck roof vent" problem that's plagued my C model since the upholstery was redone.  It's been stuck in the open position for at least 4 years and I've just been putting it off.  Well, I finally decided to take the project so I set aside a full day of wrangling headliners and trim parts and finding the necessary hardware to repair whatever I found to be froze up.  I rounded up all the tools I thought I might need, put some music on the stereo, and had a yeti mug full of ice water and started at what was to be a while of sweating in my cockpit.  I started by beginning to remove the trim that surrounds the front overhead vents and cockpit lights along with the vent control knob.  I removed the 4 small screws that hold it in place and inserted the small allen wrench to remove the vent knob.  I decided to just try to move the knob a bit to get to an easy position to loosen the allen nut when, much to my amazement, it rotated freely and the roof vent closed completely.  I repeated opening and closing it several times with a stupid grin on my face.  As it turned out the back left screw was about 1/8" too long and was engaging the gears of the vent mechanism and had locked it in place.  Total hardware needed to repair vent-shorter screw.  Time of repair-15 minutes.  Sometimes I'd rather be lucky than good.
 
	Don