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My plasma bracket is made out of two lengths of slotted angle (as used for steel shelving), bolted to a chimney breast with big Rawlbolts. Two more bits on the back of the screen hook onto M8 bolts clamped on to the bits on the wall with double nuts. Total cost about five quid.
Disadvantages: not a tilting mount & total thickness about 6cm.
To make it 15 cm from the wall, I could add some thick ply stand-offs (or steel if I could weld).
As Joe says, the further from the wall the bigger the load. Equally, the closer together top and and bottom wall bolts are, the bigger the strain. One advantage of a DIY mount is that you can make it taller on the wall to reduce the loading, and put double bolts at the top (if it's going to fall off the wall, it will be the top bolts that pull out).
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