I've never really used lathe objects all that much, and am getting a bit
confused...

I've created the lathe as shown below, and as I always thought lathes were
"solid" I was surprised that I could look down the middle of it.

I realise (I think) that I could add a point at <0,0> and <0, 56>, but then
cutting a hole in the side would still reveal the hollow nature of the
shape...

Have I missed something obvious?  If I've got it wrong (surely not ;) then
how can I create a solid shape?  Would I need to double back with the
spline-points outlining the shape?

  lathe{linear_spline 8
    <25.0, 56.0>,
    <24.0, 55.8>,
    <24.0, 31.5>,
    <23.0, 31.5>,
    <23.0, 24.0>,
    <16.0, 17.0>,
    <16.0,  0.2>,
    <17.0,  0.0>
    pigment{color rgb 0.5}
  }

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