Can anyone point me to an budget extension tube that will work with the Ultrafire F13 light I just received from Gearbest. Ideally one with diamond knurling.
As many know, the light makes for a good 1s 26650 host. I’d like the option of using a second cell (with suitable driver, of course).
I was hoping this light would work as a budget 1s-2s 26650 host, but despite looking on the outside like the Shadow host that people were using ~5 years ago, on the inside it is kind of crummy — aluminum pill with a thin, pressed-in shelf for the emitter, crummy threads, and a generally poor thermal path.
If I can find a decent extension tube, the F13 might fill the niche for me, instead.