Due to the width of some frames or by special request the horizontal frame sections will be split in two, requiring a center-joint to attach the two section back together. 

1. Match the two section numbers together.
2. Slide the sections together as show in (figure 1).
3. Align the center guide into the slot. (figure 2).
4. Insert the two 1/4x20 bolts (figure 3).

Figure 1

Figure 2

Figure 3