Here is a picture of my favorite key. I am not a ball of fire with my code but can do 30 words per minute on a good night.Here is another picture of it.Here is a picture of another one I built with the close spaced paddles(Old yeller). These were kited by the NorCal QRP club awhile back. They were rough machined brass and looked to be cold rolled steel for the base. There are no springs and uses a magnet instead. Here they are with a Kent key to show size.