This is odd, I tried to swap the heads for these two lights, which are both S2, and it seems that each pill will only fit the head that it came with. If i try to screw it into the other one is goes a bit and then jams, as if the threads don’t line up. Each pill is completely smooth in its original light. Are there different versions of the S2?
Hmm that’s annoying! I wanted to swap the heads but the newer light came with square threads and the other one I have on order is probably the same. Oh well, more incentive to build a new one xD
Maybe you can ask Simon if he still has them. There are different stores selling S2+ lights, but I’d guess it would be a lottery trying to find a specific one. So, maybe the source is the best solution
The older S2 has a slightly longer head, has a long reflector and a short pill (left)
The newer S2+ (that we know now), has a short reflector and a longer pill (right)
The left combo fits the S2+, but the right combo does not fit the S2.
The inside thread in the S2 head does not go “down” as far as the S2+ thread.
After seeing your picture I started to wonder, if you could built S2+ with S2 pill and S2+ reflector. Then it might be possibe to use 18500 tube with 18650 battery. Kind of full size shorty S2+.
Well, maybe I someday try to build 18650 using S2+ with Jaxman 18500 tube and S2 pill. Kaidomain has those pills separately for sale if I remember correctly.