J&M Roll Tarp GRAVITY BOX (Since 2011) - Manual (Page 12)

11
STEP 12 - STOP BRACKETS
12.1 Center the 1” Square Tube that is riveted to the Canvas Tarp on the CS of the gravity box. Allow the Square
Tube to hang below the top bolts on the corner brackets (around 2 1/2” below top of the Gravity Box).
12.2 Drill two holes around 14” from the end of the Tube through the Tubing and sideboard wall. A third hole
should be drilled as centered on the tube as possible. Avoid drilling through the center brace inside the gravity box.
12.3 Install each stop bracket with a 3/8” x 2” bolt and a 3/8” locknut.
14”
STEP 13 - 1 1/4” SQUARE TUBE
1 1/4”
13.1 On the opposite side of the Canvas Tarp, slide the 1 1/4” Square Tube into the remaining sleeve until the spool
lines up with the pulleys on the Spring Return. The splined end of the 1 1/4” Square Tube should be towards the
back of the Gravity Box.
13.2 With a 1/4” drill bit, drill a hole through each of the stiffening patches and one wall of the 1 1/4” Square Tube.
Also drill a hole at each end of the 1 1/4” Square Tube around 1 1/4” from the edge of the Canvas Tarp.
13.3 Use a hammer to install 1/4” drive rivets into each of the drilled holes.
13.4 Slip the Spring Return cable loop over the spool.
Stiffening
Patch
CS
OCS