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Here we have the materials assembled including a
100 line per inch ronchi grating from Edmunds Scientific.
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We drill holes around the periphery of the center
of the gallon can lid.
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Next we snip out the center of the lid.
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We have unscrewed the tube from an
eyepiece. The lid is loose on the eyepiece tube.
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We crimp the lid edge in three places and then
test on the eyepiece tube.
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OK, Its just snug now.
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Next the RTV sealant.
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And smear it around the edge with my finger.
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And drop the ronchi grating in the center
carefully to keep the glue from the center. The lined side of the
grating is on the inside of the cap.
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