RadioCassette (Broughton CH4)

Old Panasonic radio-cassette. The radio is absolutely fine, but the cassette isn't. It had begun to sound muffled, which I took to be a worn replay head. However, I never did anything with it and consigned it to our loft. The mechanism is making a sound, but nothing moves. My suspicion (not investigated) that a little tinkering and maybe a new head (if they are available) would get it working. One for the tinkerers out there.