I was fitting a new ejector on my CDPII instead of the broken one , and the major challenge was to make that concave channel for the ejector pin on the ejector's front stud.
Well, I made this jig:
with holes exactly like those on the frame (see Jerry Kuhnhausen's Volume 2, page 78 for dimensions)
Inserted a new ejector into the holes on top, put it in the vise, and drilled through the hole on the side with a 1/16 bit.
The ejector comes out as perfect as it gets:
Well, I could use the frame itself for this purpose, but
1) it was an aluminum frame;
2) what if the drill bit broke and got stuck?
Just wanted to share.