Speaking of card cages...

[Vincent Slyngstad]

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