My BX-100 (Nak) needed the relay cleaned as well. I was able to use a small piece of thin cardboard soaked with contact cleaner to clean the actual contacts. The relay was similar but the switch moved from center to left and right so you could see all the contacts from the top. Working well with cleaned ones, but yes, I did order new ones from Mauser.
Good Job Moggy
My BX-100 (Nak) needed the relay cleaned as well. I was able to use a small piece of thin cardboard soaked with contact cleaner to clean the actual contacts. The relay was similar but the switch moved from center to left and right so you could see all the contacts from the top. Working well with cleaned ones, but yes, I did order new ones from Mauser.