Step 2: Preparing The New Hinge
This hinge was chosen because, as you can see with my wife's frames, the 5/8" width is a good fit even though I had to cut the length down quite a bit.
I used the wire cutting portion of the leatherman's jaws. First I cut as far in as I could from one side, then cut from the other side, making an almost complete cut. Next, I used my hands to fold the two halves back and forth along the cuts to separate the two pieces. I used the leatherman because it was convenient. If you have the right tool, use it. The proper tool for this process would be any one of the following: tin-snips, shear, cut-off wheel, hack-saw, etc.
After cutting down the length on both ends of the new hinge, I started to bend the side of the hinge that would be attached to the lens side of the frames. The plastic had a curve that I needed to match with the new hinge so the glue that would have enough surface area to contact.