Well in case anyone is interested, this is what the shaft looked like on my 02 Quigley:
I cut the knob off just to see what it actually looked like underneath. Chances are, I'll probably just thread it now for a new knob rather than rely on this knurling.
Freshly painted shaft and new shifter knob. Its just a knockoff Momo knob but it's a lot nicer than the old plastic one from the 80's that Quigley put on there... Not bad for $8