[GreenKeys] Pics of M15 Platen knob and/or crank / keytop question

[drlegendre .]

Hey gents,

While leafing (ok, clicking..) through the M15 parts book(s), I noticed
that TTY offered both a knob and a crank handle to rotate the platen.

Is there any rule as to when a unit would be supplied with a knob vs. a
crank? I've seen the crank version, but does anyone have a couple good pics
of the knob version? Think I might want to modify my home-made unit to look
more 'correct' - and the knob type is much easier!

Finally, I'm unclear on the spring-cushion vs. celluloid keytops. Which
machines will take the former, and which will take the latter? Also - which
type are on my machine, a ca. 1941 Bell System unit, in dk. brown wrinkle
paint.

As ever, TIA

-Bill
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