Dusty Strings Harp Pickup Jack Clamp – Output Jack Mounting Bracket for Harp PickupThe Jack Clamp is a clean and elegant solution for anyone who is thinking about installing a pickup but is reluctant to drill a permanent hole for the jack. This easy to use, repositionable clamp is designed to be used in conjunction with a pickup system such as the Dusty Harp Pickup, and provides a removable way to securely hold the pickup jack in the back of the harp. It accepts a standard 1 4" jack and is adjustable to fit a wide variety of lever