Enlargening the Eyelet Mount for Leaf Springs...

Here is what I did on the last set that I opened up. I cut a 2x4 to fit inside of the hanger, chucked it up in my drill press vise & slowly drilled through the top hole, through the 2x4 & out the other side. Be sure to wedge the wood in so it doesn't try to spin on you. Take your time drilling through so the bit doesn't try to wander when drilling through the wood spacer to the other side.