I stole this idea from jurassic73, his didn't work for me. I have a Husqvarna lawn mower handle 23mm thick and I turn the tool to sit in a vertical position. I printed with PLA at .3 with support on the bed. I use 3mmX10 mmm bolts to hold it together, its design with 4mm holes. there happened to be a couple of holes in handle so I used 2 #12 X 1 screws. My lawn is very rough. it stayed  in the holder no problem.