It does look similar, except the S-20R has two little guide pulleys to the
left of the two big pulleys.

Restringing can be a real IQ test on occasion. Try an SX-28 some time, where
the machinery is much less accessible. And in addition to the dials, there
are strings to move the little band-pointer elevators up and down. I get a
headache every time I remember restringing one last year.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html