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Remixed from an excellent design by Thingiverse user and certified amateur radio operator Loren Butler (V01PWF), the intent of this project was to make a set of 3D printable iambic paddles that were as portable as possible, yet comfortable enough to use at a desk. This is the narrow version of these paddles and are not base mountable. The base mountable version is 10 mm wider and can be found here, and a mini version can be found here.

Hardware Used:

• 3x 6-32 x 1 inch phillips flat pan head screws for paddle pivots and ground contact
• 2x 6-32 phillips flat pan head screws trimmed to 11.5mm thread length for paddle contacts
• 2x 6-32 nuts/springs and washers for paddle contact screws
• 4x 6-32 1/4 inch phillips flat pan head screws for attaching the cover
• 1x 1/8 inch stereo jack or hot glue
• 1x Spring from a retractable pen (3.5mm outer diametre, 10mm length)
  or 2x neodymium magnets
  or 1x 3D printable spring designed by Mlogith
• 3x short lengths of stranded wire

The paddles use a spring from an empty retractable ball point pen, and are tension adjustable via a set of pockets along the inside of each arm. A suggestion from wz2prich is to use neodymium magnes glued to the arms instead of a spring. Arm travel to contact is adjustable but the resting point is fixed. Using springs in place of the nuts on the paddle contact screws can make adjustments faster and easier. The plug at the rear of the paddles is a 1/8" stereo jack which could lead to an electronic keyer, radio, or pc interface. A tip from Thingiverse user KD9AYE is to glue the wires in place, eliminating the need for a stereo jack. Photos of his build of the narrow and base mountable versions of these paddles can be found here. Using springs in place of the nuts on the paddle contact screws can make adjustments faster and easier.