You will
want to start by flipping the mount upside down and
mark where your hole will go. Make sure it is even
on both sides before you drill. There's nothing more
aggravating then to have your mounts off balance
from one another.

It's
now time to take that deep breath and drill a big
hole in your ride! Don't worry it gets alot easier
after the first one. Once both holes have been
drilled out you will want to try and push the mount
in.
The
3/8 saw is a bit smaller then the actual mount size.
You want to make it as snug as possible. Take the
file or dremel tool and begin to fit your mount. It
should be tight enough where you will need to take
your fist and give them a few taps to seat it.


After
your dry run is complete and the proper fit is
acquired then take your silicone and put a healthy
dose on the underside of the mount. After they are
seated for the final time and all lined up in the
position you want, you can begin to install the
fasteners of your choice.

Easy
as pie! In my opinion the yak looks much cleaner
with these installed.

It's great to be a DIY-er. You get the satisfaction
of doing your own customizing and coming up with
your own ideas. Good luck with this project.