Andy, K0SM thought that the BTA-250M that I moved to 160 meters should be rockbound again, just like it was when it left the RCA plant, so he offered to overhaul the plug-in ovenized crystal to accept an FT-243, and grind a crystal for 1945 KHz. He made a nice video of the project:
https://youtu.be/AWoHsTUmoyQ73,
Mark ~ AE2EA