You use a simulation of turnbuckles on both ends of the same rigging line. In my thoughts you would fix to an eye at one end of a line and use a turnbuckle at the other end. So a turnbuckle at both ends doesn't add up for me. I stand to be corrected but my simple logic has fixed at one end and tensioned at the other?
Alistair, I don't want to criticize Gisbod's build, but if you want to rig a DH.9a correct, there are no turnbuckles at all on many rigging lines.
I just checked some museums pictures, and there are some rigging ropes with turnbuckles, e.g. the ones starting at the front beside the engines.
But the main wing rigging, as often seen on british aircrafts, are done with flat streamlined "RAF wires" without turnbuckles. That's why the WNW manual say on page 16 for the blue rigging to use material of 0.1x0.3mm.
In real a RAF wire was a flat profiled steel rods with thread at the end, mounted in terminals.
Here a picture of the WNW scale documentation (here are additional securing plates visible):
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So I think Guy wanted to show the terminals by this brass pipes, but in my opinion the rigging material should be more wide as the recommended size.
Sorry Guy, do not want to hijack your thread!
Cheers,
Frank