Someone I know on this list has an ASR33 Teletype which has a tractor feed.
I am sure that all the ones I used at the time were friction feed. Was
tractor feed a common thing on these terminals?
I don;t think it was common (at least not for 'computer-interfaced'
ASR33s (all that I have ever seen have been friction feed), but the
pastsbook shows exploded diagrams of the tractor feed version.
IIRC the plated knob was metal and the had a large button on the end to
disengage the tractor mechasnim wehen loading paper. I may have a couple
of spare knobs in my junk box, but no other parts of this mechanism.
-tony