Well my Samsung tech just left. I was having issues with bowing, and trapazoid. I am running this 61 inch on my PS3 and one of my spare computers serving as a media server, so I was very perticular when it came to every corner and edge being square.
I asked the the tech about the "Screw" idea, and he had no clue what I was talking about, tho he did say everything could be adjusted from the inside.
The tech got everything withen 3 millmeters from one corner to the other. Took him about 2 hours to calibrate everything, and I must admit that everything is near perfect. He used a machine I forget it's name, but looked like a mini computer to place a display on the computer using componat cables. I didn't stick around to watch hm too much as I know how frustrating things can get especially if you have a customer looking over your shoulder. ( I am a Electricain, and work in alot of custom homes installing smart home systems, and such )
There is still some slight bowing effect, that can be manually adjusted buy placing a small item ( I used a small tac nail ) into the upper frame to get it just perfect. Even while using my computer to get a straight line I can not see a bow at all now. Tho if you adjust your DLP alot you will constantly have to readjust the bowing, as the frame of this item is very "Weak". But over all I would have to say that this DLP is as close to a LCD screen I have seen on any DLP, and am even thinking of buying a secound for my computer room. The only downside is the frame, but once it's calibrated, buy a tech, and alittle finnese, you can get a perfect picture.
I give it a 9/10 Only downside I would say is it needs a better frame, to support it's own weight. But everything else is perfect.