Mini Camping Burner Problem

[moribundman]

I have one of those small, pocketable mini camping/hiking burners that screws directly on a can of propane/butane mix. The flame used to burn steady and clean, now it flickers noticeably and produces a lot of soot, so it's running rich now. The little holes in the burner top seem clean, but I guess air flow must be restricted somewhere. What gives?

 

[moribundman]

'Twas a clog. Scratching with an awl followed by blowing out debris with compressed air worked. Nice and clean she burns...

 

[Gary Allan]

I need an image of this pocket-able burner. Nothing in google appears to be able to fit in a pocket.

 

[moribundman]

Every outdoor supply store sells them. This isn't even a small one:

If I google "mini camping burner", I find them galore.