So, tonight I decided to give something a shot.
Last year I had gchart build me a mini smart tailcap, which I got in October. Today I finally tried to install it.
First, I had noticed shortly after I got it that the fit was an issue. The D25C’s tailcap is… Well, at this point I hate it. The board kind of sits on there loose and rests on a tiny little lip in the body tube at the bottom of the threading. But up at the top where the tailcap board would go, there’s a narrowing of the tailcap’s internal diameter. I hadn’t noticed this or given the diameter to gchart, so the tailcap board didn’t fit up there.
Today I carefully measured and found the difference was about .80mm, and I indeed had an average of about .40mm (barely, in a few spots) that I could file off. So away I went. And I finally got the fit working there.
Next, I went to attach the smart tailcap board, and melted the Omten 1288 just enough to stop working. Nice one, me. It’s okay, I had a spare I grabbed off something. Got the board and the new switch on.
Next, whole stack was too thick. The old configuration had a thin metal washer between the switch boot and the top of the Omten. The new lit tailcap was in its place, but it was just too thick for how this D25C switch assembly is made. Even though I chose the .8mm thickness PCB. By comparison, the washer is 0.50mm - thinner than most of the components on the tailcap board, not just the board itself. I tried to use another, thinner tail switch PCB I had (to gain some space) but the fit wasn’t right for the shelf. And I ruined the second Omten 1288 I had. So, I’m fresh out now.
Fortunately EagTac sells the full assembled switch on a board on their aliexpress store, so I don’t have to worry about melting the next one I put in to get the light functional again. I have to just accept at this point that unless I can find a perfectly sized lit tail more in the style of Convoy’s - where the LEDs are on the switch PCB itself - I’m not going to get any lit tail in this D25C.
Cool thing, though: I got the “bleeder resistor” right with some graphite (pencil lead) on the OTC.