Mecatech FW01 owner/user.
No matter which lock nuts, washers etc I tried, the wheels always came loose and fell off.
I decided to try the Tourex ones as a last resort, and using 3 pointed grub screws per wheel it has solved the problem.
No more losing wheels, excellent.
The grubs screws leave a deep dimple in the plastic wheels, so I mark three spots on the wheels
corresponding with the dimples, and tighten the nuts to align them, and this has worked well without adding more dimples.
Definitely recommend, except only 8 grub screws are supplied with the 4 nuts.
GJM