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QUOTE toruble is there's very little room in the body for the decoder to go so it has to fit snug against the motor. As soon as I put the body back on and screwed it together again the whine was back

is the decoder pressing hard enough to cause part of the motor armature to rub against a casing?

will there be high frequency motor vibes being transmitted through the decoder if it is in hard contact with the motor?
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