Next I loosened up the rear axle so I would have a little play in the chain, I then slid the master link into the two ends of the chain and placed two more o-rings on the link. Next just put the outer plate on the master link. Here you can see the width of the link prior to starting the pressing procedure. Next you use your handy dandy chain tool, which can be purchased here for around $30, to press the outer plate onto the master link. It is important to take your time on this step. If you press it to far and smash an o-ring the master link is trash. I made a couple of turns with the chain tool and removed it to check the measurements several times. Example of a "check". After a couple of minutes and some patience, success! I am within 0.001", I think that is close enough. Now that I have the chain the thickness that I want it is time to take care of the rivets. I did not get any pictures of the chain tool on the rivet but it is pretty easy to find a picture of that.