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Big PVC end cap, 4 inch PVC I think.
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Drilled the 'center' by setting the end cap dome down into the drill press and usign the bit to find the lowes spot.
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I had a tap that matched the lamp tube's threads, so I taped the PVC cap.
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Dead on view of the PVC end cap and ceramic light bulb base.
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The PVC e.c. just cvoers the ceramic base, the plasma bulb and its base will stick way out.
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The socket's stud/tube came with a nifty gribbly nut, here it is in place
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