Scott Dorsey wrote:
There's no room inside there for the magnet assembly, though. The actual
element on the D-104 is pretty tiny.

The one in my parts drawer is about 1-1/2" diameter x 3/8" thick. Aside
from the dimensions, wouldn't a ribbon need an open back?

--
St. John, whose ribbon experience starts and ends with RCA 77 and 44 series