Ah that’s bad. We’ll I guess I will print it then. Maybe ask them why they didn’t included. It’s not mandatory but since they are made for it.
Keyways are dirt cheap. 1-2 € per keyway.
Link? Never needed to use one before
I could machine it but along with loctite and grub screw I think a nylon print so compact will never never break
I don’t think you understand what loads a keyway endures…
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Ive seen broken keyways so stick with steel 
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There you go.
https://www.top-industrieteile.de/passfeder-federkeil-3-x-3-x-15-mm.html?q=&form_key=7UuMuKDuBHDvEI3j&uenc=
But if you can mashine it, take steel for that.
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Ah ok well as I said never used but to me just loctite should hold on thst why I suppose it should be fine.
Thanks man!
On these motors (I think) you can use dual circlips with the keyway. This renders loctite obsolete. Quite nice to say the least. It holds all the torque. 
Tell me if theres anything i can confirm!
Be aware, that the shipping is cheaper in Germany than to other eu countrys. But that is not a real problem for you.
Did you lie with all the motors in bed already?
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… I can neither confirm nor deny this statement
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Runs to find latex gloves and pure alcohol …
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Well Belgium in pretty close so should be fine.
Take some Ouzo 12, my friend…
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It honestly is great because then you don’t have to worry as much about them getting broken off!