Hi, I'm a new member and I know that this is an older post but would love it if you and Geekvape would would hear me out. First, I love my Solo. I want a 1 battery mod and believe I have the best except for the cap design.
Second, a little bit about me. I'm a retired automotive project engineering manager having worked for tier one suppliers and the big 3 OEM's. So I know a little bit about product design. Me design experience includes window lift mechanisms, window latches and locks, stationary windows, adjustable seat mechanisms, and body in white. Body in white refers to the complete shell of the body with all holes and threaded attachments but excludes any actual attachments. Except for the stationary windows my teams design all included thread design.
Lastly, the Geekvape Ageis Solo. I bought my first Solo 2 years ago. From the first time using the Solo I found it difficult to screw the cap in requiring a lot of finesse. But in my first years as an engineer I had been taught to back thread it until you hear the click and then start to tighten it. After about 7 months is when the problems started and the cap would pop loose and eventually it wouldn't tighten at all. My first thought was that well I have big fingers and that I cross threaded it. So I took a fine sewing needle and traced the male and female thread. Both threads appeared to be fine. Still believing that I cross threaded it I had purchased a replacement plan and ordered a replacement. My second Solo arrived a week later. In the meantime I took multiple layers of aluminum foil, laid it over the battery cap opening and screwed it in. It still works like that today. Over time it has become increasingly more difficult to stay screwed in but like I said it works. After about 7 months the new one started to do the same thing. But because of my experience with the first one I took more care screwing the cap in. To achieve better alignment I would hold the cap and turn the mod. Anyone having a Solo today I would recommend always using that method. I still have the threading issue but to a lot lesser degree.
Conclusion, any good design should be robust enough to allow a person with big or small fingers to screw the cap in without having to finesse it in. I'm calling foul on Geekvape for using such a fine thread. Had you used a courser thread these issues would not have occurred. There is a video circulating (a condescending one in my opinion) that shows the proper way to thread it but used a pipe nipple and a connector. The video is true in that it is the proper way to thread it but it's course thread not that of a Solo. I would bet that many Solo owners watched it believing that it was their fault and went away not contacting Geekvape with this issue. The video targeted Solo owners saying you're the problem. I'm saying Geekvape, you didn't make a robust design by not using a more course thread. To this day I use both mods but with finesse and kids gloves. They are no longer water resistant and heaven forbid I drop them. Neither one meets the features that I bought them for but when they're working and in my hand, I only want a Solo.