1757761739852766 png
(1.07 MB, 1521x1789)

1682359716995994 gif
(114.75 KB, 112x112)

1726251373585863 jpg
(45.17 KB, 661x510)

1731345994761530 jpg
(75.04 KB, 1175x818)

 >>/54908/
This is not a "screw" to fasten stuff, this is a "screw" just to apply some pre tension.
That's why the proper "tool" for this "screw" is made out of plastic and the only torque on it is applied from the palm of your hand.
FFS Bert!

 >>/54910/
Wait, this failure mode is even worse:
Did you remove the crank arm without removing the tensioning "screw" first?
WFT Bert!

 >>/54914/
Bert... this little thing (4) is not preventing anything, it is just an indicator so you know if the crank arm is "deep enough" on the axle.
Well, Bert... have you read any manual before hand?