I have had a lot of problems with the small grub screws in Slot it wheels, i have given up on the small L shape wrench completely useless and have bought a proper wrench even though using this has not cured the problem of buring the grub screw, it looks like i will have to rethread my Slot it wheels to take P/P size grub screws which i find ok in my other cars, Slot it please do something about this, and i am careful not to over tighten Keith.