Music Hall mmf-7 spins faster

You could also be running on a 'fast' bearing,meaning you need to add some oil to the bearing well.This occurs when a turntable bearing spindle has run out of lubricant and runs too fast,metal on metal.A few drops of oil or whatever is the recommendation by the manufacturer will cure a too fast problem also.Good luck!

Yes,you can widen your platter by applying maybe 1 or 2(?) winds of electrical tape around the platter's edge.I do this with a Rega's sub-platter and it slows it down to run at correct speed.You can experiment with this until you find the exact number of windings you need.Apply single layers evenly and trim with scissors.Test with a strobe and needle in the groove playing a record.

The recommendation for adding bearing oil is in the 7 manual also.Mobil 1 is the suggestion.Rega recommend 80/90 gear oil choice of oils could be important and if your turntable was in the attic for a couple of years,this is the first thing I would try.Make sure you coat the spindle and there is a coating of oil on the walls of the bearing recess and at the bottom of the well.Also play at least 1 album before you test and make adjustments.Warming the system up is crucial as well.

The main 'bearing' is located at the centre of the platter.The spindle pokes up from it and you place the part of a record with the hole in it,through it,to hold the record in place.You take the belt and platter off and take the thing that pokes up out of it's hole.You now have a hole that is empty in the middle of the turntable,that you put oil into.Coat the long metal piece(spindle)that moves in the hole (bearing)with oil as is reasonable for moving parts and place some oil in the hole (bearing) also.The tape trick may not be needed if you oil properly,but the tweak works and that is what is needed.