You might also consider picking up one or two WECO to BNC adapters for the unit.? It would save the effort of having to disassemble it and change over to BNC connectors.
If you use the search terms "Trompeter WECO" on eBy you will find several listings, some reasonably priced but make sure that you pick up the normal version for there is also a mini-WECO plug made as well.
According to the HP data sheet, the 75 ohm output connector with Option 001 mates with the WECO 358 connector.? And if I am not mistaken, a company named MilesTek (no affiliation) has the adapter for about $13 (see ).? They also sell the mini-WECO as well.
Without dragging my 3586 out of storage, I'm sorry that I can't offer a little more help.
Greg
