Here are pictures of the homebrew iambic mini-paddles that
I use with my NN1G Mark I 20m QRP transceiver. The base is
an aluminum block that measures 0.5" tall, 1.25" wide, and
2.5" deep. I salvaged it from the trash at work. The
contacts and the phenolic spacers between them were
scavenged from a couple of junked Turner desk microphones.
The contacts and spacers are installed in a U-shaped piece
of aluminum that's screwed down to the paddle base.
The finger pads are pieces of perforated PC board soldered
to the outer fingers of the contacts. There is no tension
adjustment, but the tension is fine for me. Connection to
the keyer or transceiver is via the 3-circuit 3mm phone
jack at the rear of the unit. Little rounded self-stick
rubber feet keep the paddles from scratching desktops. The
paddles and interconnecting cord fit inside the lid of my
NN1G 20m QRP rig!