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> Does anyone know if it's possible to "fix" drilling mistakes in phenolic...

Pine, with something as critical as the GM4 main attach brackets, I
think that I would bite the bullet and re-install the whole thing. This
is an area where you can't afford to be wrong.

> Is there any limit to where the bottom of the closeout rib can be.

I had the same question when I was putting in my cockpit close out rib.
The manual is very specific as to the angle of the rib. As I recall,
when I called Lancair (Pat), said that it wasn't all that critical as
long as you have plenty of clearance for the wheel and that you take
into account the space that will be needed for the door hinge etc.
Basically, you can move it in as far as you like but moving it out
requires consideration of wheel clearance.

Bill Harrelson
harrelson@erols.com
N38BH