Yes, I met a former engineer from Exidy who explained
that story. He said
they scored something like 10,000 empty 8-track shell casings when
8-track tapes were on their way out in the late 1970s. They hired a kid
to router out the interior and then the PCBs were set in place.
The couple I have look more like they were done with a hacksaw and file.
Well done they are not!
-tony