I bought a TK-41 a few weeks ago, and had to return it due to the on/off switch malfunctioning, but I wish it didnt malfunction cause I actually really liked the light. The LED in mine was well centered. I have read posts from members who have bought different lights, and some people seem to get a light with an off centered LED, while others buy the same light and their LED is centered. I have a couple lights that have LED's that arent perfectly centered, but I dont see any strange shapes or any issues that would cause me to have returned the lights.
But if you can turn the light, and the odd shape moves around as you turn the light, then it must be something wrong with the light thats causing it. I cant imagine what it is though. I'm the wrong person to ask how to post pictures, as I just asked the question a few days ago myself, and I still dont understand it.....
I think you have to download your pics to an internet photo sharing site, then somehow bring them here from there(?) I did go to the trouble of opening a Picassa online photo sharing account, and uploaded lots of pics, but then I couldnt find the tools that I am supposed to use to get those pics here! So apparently I wasted about 4 hours....