A fully functioning turnbuckle in 1:32 scale would be quite an achievement, but tightening the turnbuckle would be a task on its own and the amount of movement we would get would be miniscule, probably not enough to tighten a slack line, stick to using heat to take up the slack.
I had to use the soldering iron yesterday to tighten a line on my latest build, the Fokker Spinne, but with there being so many rigging lines I managed to touch one of the other lines and it instantly broke, so I had to replace the line, not a huge issue just a pain. By the way, the soldering iron on the slack line worked extremely well, the line is now nice and tight.
Des.