Fellow Crafters; I finally have time to do a little work on my K2. It's Rev. A to B + other stuff. I found an envelope (a little brown one from Ele-HQ) with 2 xtals for a BFO Mod. The part number = E850008 (660003). 4.91MHz. The current Mod I found on the Ele site Refs. E850006. This must be for an out of date Mod.? I need help. Thanks, pete kn6bi