When I bought the Ryobi [One+ brushless line trimmer](https://www.ryobi.com.au/products/details/18v-one-hp-brushless-33-38cm-line-trimmer-tool-only-r18hltr38) and [expand-it blower](https://www.ryobi.com.au/garden-tools/products/details/expand-it-jet-blower-ajb01) I had a shoulder strap that I couldn't use, probably because the One+ line trimmer didn't come with a suitable place to clip on the strap. 

3D Printing fixed that! This simple bracket was created using OnShape. 

I printed this with PETG (because that's what I had loaded at the time) and 40% infill. No supports are required. 

You have to remove the ratcheting clamp in order to slide this bracket over the shaft. Said ratcheting clamp uses a reverse threaded nut + torx bolt to retain the knob, and once undone it should come off with a little bit of prying and pulling. 
Use M4 bolts and preferably nylock nuts to clamp the bracket onto the shaft. 

Ryobi One+ HP Brushless Line Trimmer Shoulder Strap

Ryobi One+ Shoulder Hook adaptor.stl

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Ryobi One+ HP Brushless Line Trimmer Shoulder Strap