Sandy, WB4OEE, Dave Ingram's widow has posted a link to her late husband, Dave's final book about keys. I always enjoyed his writing. He featured my modified Kungsimport sideswiper in one of his CQ columns. Keys IV HR https://drive.google.com/file/d/1KVLqSQyt5yY5MMz1cA833eA9eIaUwblG/view If the above fails: http://qsl.net/n1ea/KEYS_IV_HR.pdf 73 DR