Dave since reading the thread and your reply I jumped out into the garage again and had another look. Sure as hell the wing's screws are 10-32" and the original holes are 10-24", so me trying to put a 32 into a 24 hole wasn't swift. Never assume! LOL
I have since drilled the new holes exactly 1/4" from the back edge and parallel to the others. Then I tapped for 10-32" and used the same screws and additionally added acorn nuts on the inside( this will never let go!)
Now for that bottom screw, I found the 10-24 original is only about 1/4 inch long, I have the same screw in 1/2" length and it goes in nicely but is too long I will either buy another in between or shorten as you did.
God I thought I had buggered the frame up
Thanks
PS I think loctite on the original windowframe screws can't hurt.
Hell 2 or 3 threads( on each of those 8 screws) at highway speed is scary.
Tim