A couple of comments for this thread-
K-Mard didnt make edgers. Most likely if you have a K-Mart edger, it was built by a company like K&S out of Ft. Worth, Texas. I believe they built Golden Boy edgers as well, and it could be that Golden Boy was a brand name for a retailer such as Montgomery Ward, or Western Auto, etc...
I own 4 K&S built units. One of them (a two wheeled model) was purchased at Whites Automotive in Dallas Texas (Casa View location) by my mother. I was along for the ride, and likely I was under 7 years old, as I had not started school yet. This would make it a 1965 or earlier model. I recall the salesman taking us behind the store where there was a curb in the alley, and showing mom how to use the curb hopper feature- something about these units I love even today. My first exposure to working on a gasoline engine as a boy was to pull the head off this 2hp Briggs just to see what makes it tick. Likely I changed the pull rope a few times as well.
I have since owned some Whipper Clippers and a McLane branded "John Deere". McLane is a California made machine since the 40's, and Whipper Clipper is likely even older, being a mower company first. Whipper Clipper is my ATF, except I prefer the curb hopper feature of the K&S. I added a curb hopper to a McLane once, and it was a nice compromise between the stability of a 4 wheeled edger and the ease of the curb hopper.
My Golden Boy is a parts machine- not worthy of rebuilding itself due to the negligence of its owner leaving it outside to suffer the elements- but hopefully it will assist others in their resurrection. The photo below is my Dad's K&S "Trim-All", which I brought back from the dead with a replacement gas tank, and a couple of wheels from my Golden Boy donor unit.
Yes, I have a sickness I am sure. It involves small engine powered equipment. Whats yours?