When I repaired my Contender, adding blind nuts was easy and I have not any problems since. The screws just didn't have enough bite into the firewall to stand up to the stress of a nose wheel first landing. Also, for what it's worth, I added flaps and I am glad I did. Although the plane lands easily without flaps, they add a new dimension to the plane. It will slow to crawl and land like a bird.

DaveB