harbor master Premier Verical Lift Instructions Manual page 4

Step 4- The Front and Rear Base Tubes
Go to corner C. Slide the head of (2) 3/8" x 1" carriage bolts into the
slot on the upright post and slide into the slot on the top of the angle of
the end of the base tube. The bottom of the angle should line up with
the bottom of the upright post. Attach with 3/8" flange nuts and hand
tighten. Slide (2) more 3/8" x 1" carriage bolts and 3/8" flange nuts into
the bottom slots of the angles.
Go to corner A. Repeat the process to attach the other base tube.
Step 5- Connecting the frame
Lift up both sides of the frame. The front and rear base tubes will act as a
kickstand to keep the frames upright. Place the frames facing each other.
They should form a square. Ensure that the labeled ends correspond with the
correct corner.
Go to one of the corners that needs to be attached. Insert the 3/8" x 1"
carriage bolt heads into the slots of the upright posts and angles just like the
other corners. Attach with 3/8" flange nuts. Make sure the bottom of the
angles are even with the bottom of the upright posts.
Do the same with the last corner and tighten all the bolts.