Part needed

[Mike Miller]

Anyone got a clue where to find a motor, Heathkit part number 420-636, for an SA-2500 Automatic Antenna Tuner?  I've tried to rebuild mine, but it keeps burning up the brushes and shorting out.  Obviously, when it does this, it's damaging the drive transistors as well.  This can get rather expensive and rather exasperating...rather quickly.  Any assistance would be greatly appreciated.  Thanks!
        --Mike, KA9RQW

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