On Wednesday, August 21, 2013 7:25:19 AM UTC-4, Mike B wrote:


The reflector needs to be about 2 to 3 inches in diameter with a focal point

about 2 to 3 inches in front.




Mike

I won't repeat all the instructions , but you can easily find them on the internet. Look for grinding telescope mirrors. First you get a spherical surface and then make it into a parabola.
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You could probably make a form and then spin disks of metal into parabola's.

Dan