Nozzle Torque Wrench
This wrench will not allow to break the thread when screwing the nozzle to the heating block. I met other developments on this subject, and even for a long time I used one of them. But as always, something in him did not suit me, I created my own version.
I made the rotor in four options for stiffness for different types of plastic.

And also, you can buy a ready-made Nozzle Torque Wrench from Florian Wölk at this link.

Parts links below:
Wrench Head
Socket Adapter 25mm
Magnet 9x5 mm
Links to used tools:
Mini Wireless Grinder
Polishers Buffers Abrasive
Dremel Tools
NOGA deburring tool and Blades
AB Glue Epoxy (for magnet)
Super Glue 502
E8000 Strong Liquid Glue
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Thank you for every tip or donation, it means great recognition for me and helps a lot to keep going!
Update Oct 28., 2019:
Some of you have asked for the parts I used:
Bitholder with Magnet, i.e. TOOLCRAFT No. 1614136, or Wolfcraft Bitholder Magnet  60MM 2426000, or Gedore RED R47110014 3300147
Adapter ¼" to ¼" to mount standard nuts, i.e. Proxxon No. 23701
Update Mar 3., 2019:
Published a Bar to help for not so strong hands. Allows additional force but be carefully with higher torque values (>3Nm) some support is needed to prevent from breaking. See pictures and comment section. Printed mine in 2.5h with 25% infill and PLA.
Update Nov26., 2017:
Published my Torque Measuring Lever (http://www.thingiverse.com/thing:2670493) to easily test the parts with a simple scale. :)
Update Nov 23., 2017:
Added 4.0Nm, 5.0Nm and 6.0Nm cases and rotors. More than about 3Nm is not possible without the bit holder is glued into the rotor, otherwise it would slip. 3Nm means about 100 kg on the edge of the plastic hexagon. I used…