El tornillo de serie es 3x7 mm, lo ideal para mi es 3x6 mm, rebaja 1 mm el tornillo, y aplica fijador de roscas, y una gotita de grasa de teflon en la parte conica del tornillo.
The set screw is 3x7 mm. I think ideally 3x6 mm, cut 1mm screw and threadlocker applied, and a drop of grease on the tapered teflon screw.
Yes, you can't tighten all the way, need some free play to allow movement. HK Loctite would be better but CA is fine if you make sure not to get any on moving parts as this will also lock the steering. Try to apply only to screw thread.
The steering is more precise if the screw is completely in and gently tightened. Unfortunately the screw is slightly too long for this. I assemble the knuckle and c hub removed from the car and use a rotary tool to grind the screw to the correct length. Then reassemble on the car using rubberised CA on the threads and you'll have better steering with the wheels drive still able to turn.
I had the same issue. I actually used a file and then I used a die to get the starting threads back in place. Must make sure to use some type of threadlocker, I use medium strength (blue) Loktite on all of my fasteners.
Comes with the 3x7mm screws which hold the hub into the c-bracket. My son lost the bottom pair on his truck. When replacimg, use a dab of CA glue to lock the screw thread and keep it all together, not lost any screws on mine (yet).