I have quite a few mech mods, and my HCigar Nemisis is my least favorite one. I've sort of gravitated toward single-tube copper mods, but even ignoring the fact that it is a modular system with pointless little rings between the modules, there are other problems with it.
Sorry, I don't have the HCigar version. I should have specified that. At least I don't think I do, my engraving is bigger than most and I can't quite find a match for it online. I got it at a B&M, they couldn't tell me which one it is. I don't mind the different tubes. I don't use it in anything but 18650 mode though, so the kick ring and 18500 tube just sits in the drawer.
The switch is awful. The spring that HCigar includes with it is so weak that the mod will self-fire if it is put down without first being locked. Even with an upgrade to high quality magnets, the switch is still awful and tends to back itself out after a short period of regular use.
I don't have any problems with mine anymore. I tried magnets when I first got it and one of them broke on me within a week so I just went back to the springs. Mine came with 2 springs. It used to catch once in a while, but after a couple cleanings, press-fitting the taller spring into the groove on the underside of the switch (hard to explain) and some breaking in it's great now. It has always supported itself without firing, with or without the magnets. The negative pin used to back out, but I tightened mine down with needlenose pliers just a bit past finger tight and it stays where it is.
Another issue is that there is a ring with two holes in it at the top of the mod that moves freely and the holes must be perfectly aligned in order for the tube to allow proper venting. This ring slips around all the time, this thing will probably not be in the right place in the circumstance that a battery vents.... which hopefully will never happen, but for vapers building sub-ohm it should be a regularly considered precaution.
The vent holes are in the bottom of the 18350 tube, right above the threading for the locking ring. The holes you're talking about are AFC holes for atties that have airflow through the bottom or 510 connection.
All my atties, and pretty much all 22mm atties that will sit flush on the Nemmy are vented from the side though, so that's kind of a pointless feature for all but a few collectors who will have something else that will fit or the unlucky few who are stuck with a bottom-vented atomizer.
The problem I had with the top cap was a tiny bit of steel coming up past the AFC ring so nothing would quite sit flush. A little sandpaper took care of that. As a bonus, my AFC ring doesn't move anymore either. But I'm gonna get a hybrid adapter for it anyway, so again, moot point for me.
Sorry you've had so much trouble with yours. I was gonna buy the HCigar version myself but I got impatient and got this no-name from the B&M. Kinda glad I did. To be fair, it is the only mech mod I've ever owned but I've used plenty of others and have seen very little need to buy anything else except maybe a high-powered VW device.
