Craftsman 139.53993D - Manual (Page 9)

Assemble the Rail (continued)
3. Attach rail support braces to the back rail. Loosely
insert 1/4-20x7/16" hex bolts into the aligned holes of
the end rail and rail support brace (Figure 1). Do not
finger tighten.
4. Extend the drive screw a few inches from the center
rail, and slide the sleeve onto the long journal
(Figure 2).
5. Interlock the long and short journal of the center and
back rails. Slide the sleeve over the journal connection
(Figure 3).
6. Place the c-clip onto the long journal shaft (center rail)
to ensure that the sleeve does not slide (Figure 4).
7. Slide the center rail so that the center rail and rail
brace holes are aligned (Figure 5). Secure with bolts.
8. Tighten all hex bolts.
9. Repeat steps 3-8 for header section.
Figure 1 Figure 4
Figure 2
Figure 5
Center Rail
Figure 3 Short Journal