I put a 1/8" roll pin through them and ground the ends flush.
Mark, just out of curiosity, how did you attach the knurled knobs on the allthread? Did you just press them on with an interference fit and pin them or did you thread them on and pin them? I am only guessing at pinning them, in one of the pictures it looks like a roll pin is visible through the knurled knob.
Thanks.