Come on you guys, you're bumming me out!
I am quite disappointed in a lot of you for assuming the threads are all crappy and were unintentionally made loose. I own a Mini 123 and it has the "loose" threads you guys are all talking about and see no problem with it. Sure if I sit there and wiggle it and push on it, I will get flashes and other bright lights. If I EDC it and use, I will get exactly what I bought: An inexpensive, well-made light that is smaller and brighter than ANY of my other single cell lights (including an XP-G modded RA Clicky)! This is like white wall hunting to the extreme (which the Mini excels at in spades :twothumbs)! This light really is cutting edge small, and has a ton of performance to boot! As a machinist, I am amazed by this little light and the remarkable machining that went into making something with such thin walls and multi-staged lathe operations! To cut threads on a thin wall part like the Mini is darn near impossible, these are not the standard threads you see on your 6P or HDS. To reliably machine male and female threads that are so shallow and reliably engage each other every time is remarkable! A little clearance is necessary, otherwise you would need to machine head and body in tandem, and keep tool wear, tension, and adjustments identical on many separate machines. You just jumped out of the $39 price bracket.
Don't get me wrong, I am a picky consumer, but I understand that cost is a significant factor in everything that is made. Manufacture cost is translated directly into consumer price. I unscrew my Mini about half a turn and it never turns on in my pocket (of which it has several solid weeks of EDC time on it). To get to high, I simply screw in, unscrew, repeat, repeat. I've jumped levels once or twice, but it didn't affect my life too much to get to high on the second try. On my multi stage lights I miss level I want sometimes too when I am click-click-clicking through the menu. If you go looking for a problem (pressing on it to see if it jumps levels etc.) you're going to find one anywhere.
On a side note, if it turns on momentarily when you put pressure on the head, doesn't it turn right back off when you release the pressure? Isn't this problem much worse with the 90% of flashlights that have a clicky tailswitch because they stay on in your pocket when unintended pressure is applied to the tail?