The retainer ring piece on my Convoy M2’s switch is becoming loose after 2-3 times unscrewing and screwing the tailcap. I’ve tightened it down a few times now and the ring is becoming loose again in short time. Is there any way to make it stay tight? I’m using steel tweezers to tighten the ring but I’m not sure that is the problem because I’m using the same tool for my other flashlights too.
If you’re tightening the retaining ring nice and snug, you must be putting the tail cap on too tight. Try just snugging down the tail cap and see if that doesn’t fix the problem.
If it persists, you might add a bit of Arctic Alumina thermal adhesive at the threads of the retaining ring on the inner edge when you screw it in, to assist.
Good luck!
“Arctic Alumina thermal adhesive” recommend spot to procure some of this aforementioned product?? :nerd_face:
It is available at Amazon, ebay, Newegg and Radio Shack
…you can get it from Richard while ordering batteries, drivers, LED’s…Arctic Alumina Thermal Adhesive
I think I’d only put 2 small dabs at the bottom of the threads inside the tail cap where the retaining ring bottoms out. The idea being to just have enough contacting the ring to hold it, not lock it in permanently. If you put any on the ring itself it well spread when you thread it down, be almost impossible to remove. So one or two small dabs at the last threads the ring will thread into, right when it makes contact with the shelf or switch, however it works in your light.
Be sure to use equal parts, mix it well, if you have any left over you can apply it anywhere on the board you want to insulate…like the soldered connection of the red and black leads to the emitter so they can’t be shorted out. If you have waaay too much left over, don’t throw it away, cover the board with it. The entire mcu, the legs on the chips, anywhere there’s exposed connections. This will insulate every connection and also re-enforce the solder joints and make it strong for better abuse tolerance, such as on a gun mounted light.
Oh yeah, it’s an epoxy so it sets up pretty fast…like 5 minutes or so. It can be peeled away fairly easily in the 1st hour or two, after that it’s much more difficult to remove.
Try cranking it down with needle nose pliars first…or you could use conductive Wire Glue
Thanks for the suggestions guys. The needle nose pliers in my toolbox are too broad for that. I don’t have Arctic Silver thermal adhesive but I do have the a tube of cheap thermal grease for CPU. Can I use this?
A couple of drops of loktite.
Just make sure it works before your “set” dries. I just found that my McClicky in a Solarforce doesn’t like being over tightened. Quits working altogether. Simply loosening to retaining ring back to “snug” and all is well. (was working on it, over tightened it)
A simple fix for now I will be using the head to swap the battery. I also removed the cap thingy to allow spring to extend longer. I’m using an unprotected Sanyo UR and it is shaking inside with the cap on the spring.
“the needle nosed pliers in my toolbox are too broad for that” , file those bad boys down! 
I’ve always filed the needle nosed pliers in my EDC tool to a point for splinter extraction. No need to go that far but you can narrow them down and then drill bigger holes in the retaining ring if necessary. 
Borrow a pair from your neighbor.