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Originally Posted by UberBlue
It's bright idea time again...
Distance between the block and the wall would magnify any distortion in the base.
If eye level was kept on the same plane as the laser between the block and wall, it would eliminate percieved error caused by irregularities in the wall.
Before I put on my nomex suit to brace for the flames, think of this... Why do telescope mirrors have to be so perfect.
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Is the block perpindicular to the wall, or slightly angled towards it.
In the pic, it's slightly angled, not sure if this is intentional or just a mess-up.