Anyone using stacked Efest 18350s with the extension cap? If so, does it seem like a REALLY tight fit? I can barely engage the threads without applying so much force I'm afraid I'll break the solder joint on the positive post inside ...
Really?
I did make a minor alteration to my spring when someone else pointed out a potential hazard, which fixed the hazard and gave the spring a little less tension.
The spring isn't coiled properly and you need to take one end and bend in it's point so it's facing downward.
If you've been using either spring "as it came", you should notice that the bottom of your battery(s) are forming a circular channel from the spring wear. That open point is carving a channel into the bottom of your battery every time you screw on the cap.
Bending that open point downward through the spring's center will prevent your spring from rupturing your battery and will relieve a little bit of tension.
Hope this helps a little on yours, it did on mine.
