Add a wind instrument w/o removing mast?

I have a 2004 C387 without a wind instrument.  I would like to install the Garmin GMI 10.  Does anyone have experience fishing the cable down the mast?  I had a local electronics company look at it and they said the mast would have to come down.  Then they recommended a wireless Raymarine.  I have a coax TV cable  up the mast that I do not use.  Could that be used to pull the new wind instrument cable down?Thanks,

John Kaplan

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