Replacement for Tremolo Holding "Nut" on JP-100D

Does anyone have any idea where I can find a replacement nut for my JP-100D? While doing an upgrade on it with the Graphtech Ghosts saddles, I had to drill some holes in the actual plate, and the top Chrome Plated “nut” cracked when I was removing it. Not sure if the damage was already there. The rest of the assembly is fine. Just the top Chrome Nut that the bar slides into and the Allen screw you use to adjust the tension of the arm is what I need.

Thanks,

Rockguy66