FYI, and sorry to those not interested: Ebay item # 3737024854 is a set of 15 replacement slide pots for the MG-1. Seems pretty reasonable at $35 buy it now. If you have the black goo problem with your MG-1 this might seem cheap !! Not mine, but I have purchased from this guy before.
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MG-1 replacement sliders
2004-07-19 by J. Larry Hendry