I then could use the template to verify the hole edge clearances. Initial fit looks really good.
I then used the cardboard template to cut some 0.032” material to size. I then started to trim the aft end to clear the rib and was able to make initial marks of the rivet holes to reconfirm proper edge distances.
Next I clamped the strap to the assembly and committed to the aft hole.
Once that was done, I checked fit again clamped one more time and finished drilling the other holes. Now that I have the correct holes, I now have a solid strap piece with an abundance of edge distance.....however the fit in the rib is a bit too tight. At this time, I used that piece to make the left strap.
Being that I drilled the rivet holes, now there is no guesswork as to my edge distances and I could easy mark them and work the fit. And with a little time on the sanding station, files and 3M wheel I was finished with the Aft F-623A attach straps.
Next I clecoed on the side skins and opened up the hole in the skins for the steps to #30. Using a long #40 drill bit I can see the center line of the step tube. I just have to figure out how to scallop the F-623 corner ribs...hmmm.
