The SX arm is not weak at the kingpins like the Losi is. I can see what you are thinking with the X-factory screws, but it would be of no benefit - infact it is likely to be a hinderance as those screws
can sometimes tighten the movement of that hinge if holes aren't drilled straight enough.
The weakness in the SX arm seems to be around the ballstud. This can be fixed.....
The ballstud has a shoulder where there is no thread. On an unmodified arm this stresses the plastic, but if you reem the screw hole for the first 1mm ONLY, this shoulder on the ballstud won't stress the arm and will make it far stronger.
Use Schumacher Mid-flex wishbones, and it should be damn near bullet proof!!
