toy,
Take a look at Schultz' edger. It's a very straightforward design--I think even I could build one (if I had any welding skills). I have the PT trailer towing attachment which I use only occasionally. After touching base with Schultz, I am planning to make an edger this Winter using box stock, so I can slip the end of it into the standard receiver of my trailer tow attachment for edging, and I will still have an unmodified attachment for towing my trailer when I need that--- a bit of multi-tasking from an attachment that costs $265 currently, as opposed to nearly $400 for a new, one-task-only, PT edger. Only problem is since I don't weld, I have to find someone to fab for me.