Hello there! So I just got this very nice, Sony WM-D6C professional stereo cassette-corder. But it is making strange noises, which was to be expected! In the video, 24 seconds in, you can clearly can hear the noises: Hopefully it is something that even I can fix!
The noise sounds like some gears grinding together rather than a dent in the flywheel rubber. The REW / FF selector and the auto-stop mechanisms are prone to getting stuck due to the grease going hard and it is possible that these parts are not moving freely and partially sticking.
If I'm not entirely mistaken, the motor hangs in a little spring balanced cradle, occasionally it may rattle off a tiny bit*, two tiny pins should go into two tiny holes, and if so you may both have a partially working machine and strange purely mechanical noises. The motor drives the flywhell via pressure-to-rubber ring, much like in the DD-series, only with most of the rest of the mechanicals more similar to the TPS L2. *re-positioning isn't really that hard but you need to be careful on your way into the machine. Naturally. Lots of cables and thingies...
