I cut a 12mm wrench down so it was shorter to fit the open end in easier on the nuts. I think it is probably about 3 1/2" long. Then just flip the wrench over to get the angle better to fit the nut. Should come off easy then, takes me about 30 min. to change one out. Once you start it's easier than it looks.I don't know of any links showing this. Hope this helps you.