The feedback you get around here is super AWESOME.. 
Here is a picture I got from that other thread. The spring is wrapped around the pill. My spring looks much bigger, that is why it hangs loose. My spring tries to grip itself to the walls of the casing. Whereas, this one does it differently, and clings to the pill as shown in the picture!! ???
Can you bend the spring (ie. twist it into a tighter circle) so that it does grip against the pill tighter? Not a great design, but this fix might make it an acceptable light.
I think you just have to rack this up to the "Lottery" we all play with buying Chinese budget lights, unfortunately. I am ecstatic if I get a budget light that doesn't need any attention. I just come to expect they'll need something done (at least thermal compound added).
-Garry
cehoward, in my opinion, you should not have to be able to solder to use a light (I certainly don't). Many on BLF do enjoy the fixemup lights, but I for one do not. You've tried this one twice, and I think we all agree it's poor design - spring should either be soldered or grip the pill very tight. I say see if they will credit towards another light, as this one is probably not going to work for your purposes.
:bigsmile:
One could use a vice or a pair of vice-grigs and smiply tighten one end of the spring so as to have it hold tight on the pill.
>) >)
Thanks to Kramer for posting this:
https://budgetlightforum.com/t/-/2821#comment-112576
Which allowed me to see the spring around the pill.
And tadpolPilot for suggesting to tight the spring around the pill.
Okay, me and my all thumbs, went took the light apart, the bottom of the spring, I squeezed it until it was a tight fit on the pill. Didn't do this before, the spring was hanging loose all the time.
Anway, with the spring tight around the pill, I put it all back together. The light came on, and then I held it in my hand and shook it hard! No mode changes. With the light in my hand, I bang it on my leg about 10 times. (hurt too), as to simulate rough riding on the bike, NO MODE CHANGES. Going to put it on bike tonight, and ride over the roughest ground I can find, if no mode changes, and no more on one day, and off the next, this light is a KEEPER..
Here are pics of the SUGGESTED FIX!!
Here I am picking up the pill by the spring and the pill is staying attached to the spring, this was never like this before..
As in this picture, the spring is not moving around,
Right now, you all should see the smile on this 72 year old kid!! Can't wait until nighttime to try this out. I am almost sure this is going to work.
One more thing, not trying to plug Tmart, but they have been SUPPORTIVE from day one on this. No return shipping, and at every instance, I get an apology, and and offer for a refund, with a return label. IMO, if the other companies were just 1/10 as good with their customer service, it would be super good in Flashlight World.
I am going to say BIG THANKS TO ALL, you guys/gals are GREAT/SUPER/AWESOME!!
That is exactly what I did. It looks like that was the fix too. (thanks to all on this forum) Going to ride tonight over bumpy ground, and I should not have no more mode changes or not working stints.. 
That has been my experience with Tmart also and why I was eager to work with them on a group buy for the SR King. Unfortunately they have been slow to react to my suggestions on what needs to be done to make anything happen with the King. I haven’t heard from them in a few days after trying to contact them about it. It’s a shame but I will continue to buy from them when the price is right and often it is. It’s worth the fast US shipping and great service.
Nice to know it works... Everyone likes a happy ending.
Johnny, in all my dealings with Tmart, their regular reps are great, but I always cc the same message to Sherry Ye, who is on this board. She comes and backs up the already good customer service.
If you get the time, email Sherry your concerns, and see if that helps. In the meantime, I am happy as a lark over this light. Can't wait to go outside.. 
After two test rides on the bicycle, and the ride this morning, once in a while it will change modes on a bump. That is a long way from not working at all, and when working it would change modes on almost every bump. Now, if I can find out where it is contacting to change modes, I might be able to fix that.. I hope. But, I am keeping the light. The way it lighted up the way for me this morning in the dark, I want this..
Glad you were able to make the fix without having to solder.
If I had to solder, I would have been dead in the water.. Where is the gizmo that makes it change modes? In the tailcap?
No its on the driver board, typically an Atmel (or similar) SMT EPROM chip.
Often times its the battery bouncing-shifting around that momentarily disrupts power. The EPROM senses this power interrupt as a mode change flip.
You could still solder it do direct driver.. oh, solder. :/
Or make solder some brass into the hollow part.. oh, solder. :/
You see, I'm making fun of you. :)
But srsly, I'd try to make the body transfer electricity without need of a spring, I guess on that light, you'd have to remove anodization somewhere
Funny thing too, I used to be super expert at casting bullets (hot lead), but can't do jack with a little hot tin!! 
However, I am moving foward on this. Now, I know what it making the light chang modes, will try to see if I can make the battery chamber a little tighter to stop the movement..
ce, wrap the battery with masking tape. Start with one wrap around on each end to start, add on as needed. Should work like a charm.
Thanks ride, going to try that tonight..
I'm a new member, hello all.
I have this light and was having the same issue. The battery adapter moved freely about an inch inside the light. So when I pointed the head up, the adapter would slide back.
When I pointed the head down, the adapter would slide forward and tap the spring on the head. This would cause a momentary disconnect and switch modes.
I put some gauze tape around the adapter and kept it tight. Worked perfect. If your not using the adapter, I think BetweenRides has the right idea by tightening the battery and that hopefully will resolve your issue.
Once I did this, it's really not too bad of a light. Good luck.
Aloha and welcome to BLF Bigpal!
Welcome to BLF Bigpal