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That slight mismatch adds to the overall positioning error
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Yeah, the bottom of the bottle was bigger than the top…
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The solution is straightforward: put some tape over the vent!
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The exterior view shows why you use wax for the first pass…
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Having gotten our new helmets up and running, I decided to tear down my old helmet to see what’s inside.
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It almost worked, but the edge of the clamp tapered the wrong way.
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I don’t actually plan to use this one for anything, but if I need a somewhat scuffed mirror in a pinch, well, it’s in the box!
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The general idea is to put the capsule in a small brass tube (from my box o’ random cutoffs) soldered to the end of a copper-wire boom lashed to the helmet.
The Smell of Molten Projects in the Morning 