Thought I'd post this WIP to show how useful 'shear' can be when you need to create awkward shapes. (Although why I'm giving my secrets away is beyond me ;-))

The flanges on this piece were made by creating a heavily rounded cube from Spacebone's collection of enhanced prims and booleaning two opposing faces flat. This gives nice flange faces that have heavily rounded corners. Now by turning the flange about 25 degrees or so and then reducing a side by using the grabs, the whole thing 'skews' or 'shears' to give the kind of diamond shape you can see here. Simple! Try it for yourselves!

BTW this is a 'steam fountain', used to direct steam from the top of the boiler to other parts of the loco, but not the main driving pistons.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...