The Galactic Capstone has an open base which easily slips over the top of your Stargate Meditation Pyramid or Russian Geometry Pyramid made with the 76.345 degree angle.  

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This Capstone will add 3 inches of height to your Stargate Meditation Pyramid but may need a few more inches of ceiling space to clear the apex.   Keep the zip tie secure at the peak of your Stargate Meditation Pyramid.