Railroad Spike Capo for Your Guitar or Banjo : 7 Steps (with Pictures) - Instructables

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Set-up Trick # 2: seating a railroad spike

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Installing Banjo Capo (Railroad) Spikes

Banjo capos and spikes available at Eagle Music Shop.

Railroad Spike Capo for Your Guitar or Banjo : 7 Steps (with Pictures) - Instructables