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How to make an hourglass from two lightbulbs

Step 8The collar and the sand

The collar and the sand
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With a pin pierce the center of the metal disc. Not too small so the sand can´t pass, not too big so ... you run out of time!

Fill the bulb with the dry and clean sand

Place the disc over the hole and fix it with a bit of glue.

Now you can put it inside an oven to remove all partial humidity it can remind if you work in an humid area as I do.

Place the second bulb on top of the first one. NOW, THE NEXT STEP IS THE NO RETURN POINT SO YOU MUST BE COMPLETLY SURE OF ALL THE PREVIOUS STEPS .

Glue with with epoxi.

When dry , wrap some cotton thread or fabric., so it will look nice.
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