Q.edge my sidewalk without using a power tool
I want to edge my sidewalk without using a power tool. I just want to cut the grass on the sidewalk and stone retaining wall. I do not want to purchase a power tool. I have been to two large box stores/retailers and they do not have anything that will work. I envision a round, sharp wheel on a long handle that cuts as you roll it. Does such a thing exist? Help! I really want to do this and really do not want to plug anything in or burn any gas in a motorized engine. Just want to use my muscle power without making it impossible. Thank you!

Search "manual garden edger"
There are a few different types available.