I was in agreement with Roger that you should just refer to stove maintenance article that he mentions a few posts up since the source is much more authoritative than myself, but then I received and opened up my second BRS-3000T. While my first one was acceptably well made, the second one was what you might think of as stereotypical "low cost country" junk. I'm posting this as a reference in case you receive a bad one as well. I wouldn't take one of these out into the field without fully disassembling it first to determine its quality.
First, mount the stove in a vise as shown (or hold it with vise-grips) and unscrew the burner section by inserting a close-fitting rod (screwdriver, nail, etc.) through the air intake holes. A 5/32" or 4mm drill bit is a good fit.

So that it will be easy to unscrew this joint later, remove all (or most) of the thread locking compound left in both parts of the threaded connection that you just unscrewed.

Now unscrew the jet using a 6mm wrench or socket (1/4" might work as well, but it felt a little loose and I would be worried about rounding off the hex, as this jet was very tight).

The first bad sign – a big metal chip inside the jet.

Now drive out the safety pin holding the valve needle from the top side as shown using a punch or small nail.

Unscrew the needle all of the way out of the valve body. Here's where it gets really nasty. I could tell by the feel of it that something was wrong.

I can't know if some of that debris was in the sealing section before I removed the needle or if I just collected it on the way out, but some of this was almost certainly on its way to causing a valve failure in the future.

Note that the black curls in the picture above are part of the o-rings that were sheared off.

Typical "never replace tooling unless it breaks off" machining quality. The threads are terrible. The really big problem is that the tap was driven in so far that it gouged the lead-in to the seal bore, pretty much guaranteeing seal damage, even with all the debris cleaned out.

I've attempted to smooth out the entry to the seal bore using an abrasive rubber deburr tip. This would typically go into a Dremel but I wanted to go slow so I chucked it into a drill. I was lucky to have one of these that was the perfect size (just smaller than the diameter of the threads, but large enough that it wouldn't go into the seal bore), but they are easily dressed to size with a stone if the size isn't right. The silvery ring on the tip shows where it is making contact with the seal bore entry. I couldn't get a usable picture of the seal bore.

The bore itself isn't the smoothest either, but I think it will be good enough to seal properly if I can get o-rings to go in without cutting. Next step is to order replacement o-rings and see if the deburring was effective. (Install new o-rings on needle, screw into body, remove, inspect, repeat until satisfied.)
Here's a parting photo of the stove fully broken down. I don't think there is any need for you to remove the canister seal o-ring.

-Stephen