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Thanks Okapi for your kind words - actually I wasted less than 2 hours for "the tryouts" (I wouldn't even call them "scientific") .
I learned a lot - for instance that my assuptions aren't seldom clouded by my ever-present eagerness and comfirmation bias.
And, as Tony pointed out: Carbide comes in a lot of varieties, and masonry drill bits don't have HSS shanks.:)
-Christ - I could've just tried the shank with a darned file...
Regarding your English, I don't personally think you have anything to apologize for,
but then English isn't my native tongue either.
All the best!
Johan
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Thanks Johan, just as a complement, concrete drills have a shank in a serious quality of steel with a very high resilience and a high resistance to the twist, just try to fold one, then it's a good support for the purpose, I've brazed hard metal on old drill shank to drill bigger holes in concrete, it's very easy to make with very good results.
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