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Unlike the splined metric inserts, these inserts have actual knurls
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The northeast vent on the well pit grew an ice rim
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The most recent occupants surely piled more twigs & grass atop their heap
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It’s the only choice they offer
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The cupped surface fits the curvature of the bulb
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With a touch of fire in its hole, the IBM 21HB5A Beam Power tube looks just flat-out gorgeous
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They match the dimensions of “real” tube sockets pretty closely
