Here is my custom comb pick. It works on my Master 140. The prongs/bristles of the comb comb could be a tiny bit shorter, but it does work as is.
Made from a hacksaw blade.
Scan at 600dpi:

Scan at 600dpi, on black background:

PNG image of the template I made:

Open any of the files in your image editor of choice, and print at actual size (no scaling, 100% size), and they will produce a paper template. Mind the shadows in the scans, particularly the one on the white background.
The bristles/prongs are 0.05 wide, 0.11 tall, and the gaps are 0.07 wide (all in inches).
All images and work is my own. Shout out to GWiens2001 for his advice.
-Krebs