Someone posted a picture of a plastic one of these on my FB page, suggested I could turn one.
It also satisfies my need to make things from off-cuts and scraps.
4 axis later!
It's a 25mm hole in beech overall width about 80mm,
But what is it? (It's propped up on a couple of map pins, so ignore what's behind it).
C&C if you feel so inclined.