Leading Edge hold down blocks
Then, the piece was cut out to the dimentions shown in the Curtiss drawings. Notice the tabs that hold the wooden block in place.
Here's a trial fit. As all the other leading edge fittings, it will be brazed in place. The final drilling of the bolt holes will have to wait until the fuselage is built to ensure accuracy. U-bolts will go around the upper longeron through these blocks to hold the stabilizer in place.