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@Sharkstar
Loic, I had exactly this issue with an old freewheel and that tool. I used an old coarse sharpening stone to grind the teeth down. I would lend you the tool but I destroyed it, and the freewheel, as it turned out to be seized on too tightly. Use penetrant spray. Secure the tool before you turn it, and be careful as you start to untighten because the diameter of the tool is slightly smaller (or larger, I forget) than the freewheel it engages and is liable to slipping.