By the way, I suggest you get a bag of those set screws (part #86094). Those tend to fall out often, even with blue loctite.
Now, if you upgrade your brakes to the HPI dual metal discs, the heat generated by the dual discs will cause the metal parts to expand and bond together. This will mean that the setscrew will have to be drilled out and the hoe for the hex dogbone cup would have to be retreaded (retapped). The only upside of this is you will not ever have to worry about 86094 falling out again.