From: jwsmobile: Wednesday, March 09, 2016 11:49 PM
Different than the 8/A 400.
Here is a very clear photo of the card guides and cage for that beast.
http://www.retrotechnology.com/restore/8a_1sttest_trans.jpg
It is likely that with decent photos of one of these (outside the card cage),
and maybe a couple of measurements, I could whip up a design file pretty
easily.
Isn't it essentially a row of circles with the right diameter, spacing, and
depth (ending on half-circles), with some snap-in clips on the back?
Vince