Thanks very much, it is a 6mm x 1.5mm vial covered with UV glue.
I had to dremmel a groove out of the switch to have it recessed, it was a real pain to do but turned out ok.The black stuff in the cutouts is JB Weld. I wasn’t happy with the GITD stuff.
Thanks for the tip Stevi , but I’m affraid I’ll just screw it up if I try to do such a mod. My fingers are anything but small/steady and I’ve never been good at glueing (and dealing with) very small parts.
Yeah that was my original idea, I had ordered two 6mm x 1.5mm vials but they were too wide to sit in the grooves at either side so I decided to dremmel out the actual switch to make one fit.
I also thought one or two of the 6mm x 0.65mm trits could sit in the existing switch groove and be covered by a dome of UV glue but they would probably be better in the slots each side of the switch as it protrudes enough already.