How is the ground ring on the switch? Does it look to be making good contact with the ledge inside the orion? I had one a long time ago, that I fixed by re-soldering the ground ring on the PCB of the switch.
Pretty sure a new switch will be in order. I hope you can still get them from Pailpoe! Biggest thing I find to maintain switch life. No extended dry burns and ensure no leaking through positive pole into switch.
What part is the ground ring on the switch. And why would it not work with 3 different used but workable switches and now you have me scared, are you hinting that Pailpoe is not selling switches anymore?