Reminds me of a notorious generic fault with Philips car cassette
players of years gone by. A steel disc set in a hard plastic periphery,
differential expansion with cold or heat (never discovered which with
the Philips). In that case periphery was of pulley form taking a drive
belt, this time cog form mating with a drive cog.
Part of the take-up spool structure of Sony EV S700 video8 VCR from
1985 , used in 6 channel audio mode, so again a functioning m/c required
to salvage audio from a tape archive (like the DAT m/c in recent thread
here}.
I placed the broken away quarter of the ring gear back with the
remaining 3/4 ring and there is a stress-relieved gap of about half a
tooth. Any advice?
At the moment I intend grinding back a sliver from the steel, along its
exposed quarter, to allow the bits of plastic gear to align again, and
allow non-jamming tooth engagement. There is a bit of a ledge to the
plastic cross-section to allow for some glue along the length as well as
the broken ends. This spool drive assembly contains a magnet that
"engages" with the steel disc , as a slip clutch