The tool did not fit the nut whoever makes these they need to get the the size correct 11mm, I had to file down the edges and tap it on the nut. So poor quality and build for the price.
Would be a nice tool if it actually fitted the nut it was supposed to adjust.
I have two rotax 122 engines. Tried on both I can attest that the tool is made too small to fit over the nut it was designed to adjust. Cannot recommend.