Door threshold hold down screws

[chewychevy67]

So instead of using the original sheet metal type screws for my sill plates I decided to use t nuts like this. They sit in the hole you drilled and give you extra thread for a real threaded bolt. Nut gets welded/glued on the flange to the body underneath and it will tighten better without stripping and it will still look like a truss head from the top. I used shorter bolts than what was in these photos and they are phillips head for a factory look.