Brief Description: Remaking the attack block assemblies
I removed the forward attach block assemblies off the left wing spar and took them apart in order to replace the attach blocks. As suspected the 3/8" holes are only enlarged on the forward side of the blocks which means the angles are intact. This is good because this means I can use the existing holes in those to drill the blocks on the drill press, otherwise things would have become more complicated. Doing this was almost too easy, I first clamped the new blocks to the angles and then drilled the 1/4" holes for the bolts using the holes in the angle as a guide. I then installed those bolts and finally drilled the new 3/8" hole through the blocks again using the hole already present in the angle to position the drill correctly. Everything was done on the drill press and I could not be more pleased with the results this time. I finally installed the attach block assemblies with the new blocks back on the spar and did various tests and measurements to ensure the holes perfectly straight, round and not enlarged at all. The bolts need some tapping with a hammer to get in/out of the blocks, this is great, perfect fit! This was the easy part though, now I need to start on the forward attach angles in the fuselage.
