If any time-nut is in need of a bc635VME/bc350VXI Time and Frequency Processor 8500-0019 User's Guide Rev.B I have one for the cost of mailing. It's 8/5 x 11, and just shy of 1/4" thick. Includes setup and operation plus schematics and parts list. If you would like it please email me off list. Regards, Skip Withrow