It sounds as though something is causing the rotational velocity of my Bush MTT1's platter to increase then decrease once per revolution. The effect is a slight but noticeable warbling. Anyone got experience of fixing this sort of issue? I haven't yet pulled apart the central spindle as I'm not sure if I'll be able to put things back together afterwards.
Apologies if this is a trivial issue; I'm fairly new to the world of vinyl.