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@edmundro
Misc chunks of stuff that are a different density to the surrounding material can do it. A rougue oversized flint or similar in a bit of concrete can certainly wreck a thin disc. Not sure how it could be applied in this situation but combining the chainsaw material with something likely to break the disc has got to be worth looking into. Guessing many thieves using battery powered grinders with thin discs would be thwarted pretty quickly..