Resquare Bike Vise prior to drilling 2nd hole
-Mark and Drill the 2nd hole as indicated by yellow pencil.
Mounting
Instructions for Bike-Vise: 16 photos with FAQ
click
on pictures to enlarge
Photo
4:
Resquare Bike Vise prior to drilling 2nd hole
-Mark and Drill
the 2nd hole as indicated by yellow pencil.
WHY only drill those 2 holes? 2 Holes will align the top and
underside plates.
THEN, you can use the plates as "templates"
for drilling straighter holes.
-Go to next photo
Photo
5: 
Place bolts in the 2 drilled holes for alignment.
-Grab your
tools, Drill with bit and Underside Reinforcing Plate.
-Go
underneath trailer to mount reinforcing plate.
Note: If doing this by yourself, you may want to place a
box-end wrench on
the bolt-head so you can tighten the nuts while underneath the
trailer.
"Righty tighty-Lefty Loosey" still applies.
Photo
6: 
Mounting Underside Reinforcing Plate
-Using the 2 bolts you
placed in the 2 drilled holes, attach underside plate.
-Tighten
down bolts/nuts to 20 ft lbs.
-Partially drill remaining holes
from the underside using the reinforcing
plate as a template.
WHY only partially drill holes from the bottom? Because it is VERY difficult to drill straight holes that will align with the top mount. It is easier and more accurate if you finish drilling from the holes topside.
WHAT'S the purpose of the "Reinforcing Plate"? The Reinforcing Plate distributes the load when used on wood trailer beds. The Reinforcing Plate also serves to prevent "tear-out" of the bolt/nut through the metal or wood flooring especially under high side loads imposed during a Mach 2 turn that some folks make while towing a trailer.