Thanks everybody.

All surfaces and cylinders are from roundedge.inc. That really improves the look
a lot, much more natural.
The bolts and nuts are from Blender. I couldn't find a Povray equivalent, so I
want to create a Bolt macro, and a Nut macro. I found already that f_helix2()
creates a good looking thread. Then throw a selectable head on top and done!
Here are two more snapshots of my traction engine:

Cheers
Ton

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