The first cam units that were available to the public had solid stems and were either Lowe cams or Friends which were made by Ray Jardine patented by Wild Country in England. Sometimes the cams when placed will turn or walk further into the crack where it becomes harder to get a persons fingers on the trigger bar to retrieve the cam from the crack. Ed Leeper came up with a great cam removal tool named Friend of a Friend. This removal tool can be used with many different cam devices. The Friend of a Friend was created in 1981 showing up in the Leeper 1982 catalog.
Leeper Friend of a Friend being used with a Wild Country Friend