I don't
think an O-ring is very suitable here, you want
something with a rectangluar cross-section.
Does it have to be? Though I suppose I need something that's solid and not
liable to shift around so the speed of the drive will be constant.
The reason for wanting the rectangular cross-section is that it will
increase the contact area.
Constant speed probably isn't _that_ important. On most of these units,
the idler is only used for rewind and fast forward (and maybe for driving
the takeup spool clutch in play/record modes). The tape speed is
determined by the capstan and pinch roller in play and record (which is
when it really matters).
There's a car interior restorer just down the road
from here - they might
know, though with a name like 'northumbrian leather interiors' they might
not :)
Thinks... There used to be a company called 'Eastwood Tools' somewhere
near Bristol (Yate???). They're the sort of place that would have stocked
it. Dunno if they're still around, though.
This is a full-size platten, in 2 parts, with
differential
gearing between them (to keep the paper running straight!).
Should be 'interesting' to repair...
Ick - sounds like fun!
Yeah, the service manual just tells you to replace the platten. At least
I know how to take it apart.
It's a zog. I have loads of spare parts for this machine (complete set of
PCBs, front cover, control panel, motor, nib PCB, back electrode
assembly, etc). But no spare platten. Mind you, a spare would be old by
now and would probably have decayed...
-tony