I've had my 401 for 20+ years without any trouble at all. For the last week or two, I've been playing only 78s but decided to play some 45s today - however, when I changed the speed selector to 45, it still played at 78. So - 33 plays at 33, 78 plays at 78 but 45 plays at 78. I've done nothing else to the 401 apart from change the speed. Does anyone know what might be causing the problem - and how it might be fixed?