Sooo not suitable for cameras

to my mind, the part of cameras is not really well suited - it is too imprecise and too shaky. I use only for external flashes - there is sufficiently stable. However, "attacks" it worse than expected, which means that I can not place as freely as expected the screwed-in flash.
But what is also very satisfactory: to screw the camera / flash you need a coin, because the mounting screw has no knurled nut, but a slot for tightening.