I have a Hcigar Stingray also and have the same issue as the OP. Button sticks and is weak. I have disassembled and cleaned, it helped a bit. But still doesnt perform.
Since this didn’t work I have disassembled and studied the switch. The following I have noticed.
1. When sitting the mod upright it would tend to want to lean to one side all the time. I have noticed that it leans to the side opposite the small pin in the assembly of the switch. I verified this by removing the pin and reassembling the mod. Now it leans it whatever direction it wants.
2. I have noticed when disassembled the small pin that holds the switch together is much smaller than the slot, so I installed a nemesis pin which was longer in it and it did “solid” the switch up a bit but didn’t render it completely acceptable.
3. After that I studied it some more and found that the center post of the switch and the threaded brass piece that slides over it are ever so slightly loose and allows wobble. Where there is wobble there is sticking. So that leads me to believe that the center post and this brass piece are not machined tight enough to allow it to slide and be solid at the same time.
4. I have also noticed that the magnets where designed to be much smaller in diameter than the switch itself. Thus allowing a “teeder todder” wobble effect when pushed. Centering the pushing of the switch becomes more important because of this.
Here is another beef I have with this mod right now, I cant stand it up on the switch. It leans and will fire itself with the lock ring in the fire position. Not good for a dripper.
So, here is where I am with this. The only thing I can think of that might help is a set of stronger magnets forcing a more center push of the switch. I haven’t tried this yet as I haven’t had time to research where I might acquire these magnets.
If anyone has an answer to fixing this switch it would be great if they could comment in here. I like the mod but if I cant get a fix it is going in “FILE 13”.
Cant really say I agree with this switch being an improvement over the nemesis switch, I have 2 clones and neither have any problems. They are sturdy and fire every time.